Hotburple

The Hotburple is a Boulder Class dragon that appears in How to Train Your Dragon 2.

Official Description
"The Hotburple can be a hot mess. Literally! A louder, fussier and lazier Boulder Class cousin to the Gronckle. A nap is never too far away. The slow Hotburple is anything but lazy when it comes to battle. Opponents will have trouble getting out of its way!"

- Dragons: Rise of Berk

Development
The Hotburple is inspired by a walrus, tadpole, old bulldog and trash can.

Egg
These dragons' eggs are oval in shaped. They have large, smooth bumps all over it, just like those on an adult's body.

Hatchling to Adult
Hotburples strongly resemble their Gronckle relatives, although they have a larger body and wings, as well as their eyes being positioned closer to the snout than to the ears. Hotburples also appear to have a larger tail bludgeon and a slightly smaller jaw, but with sharper and smaller teeth compared to Gronckles. Like Gronckles, Hotburples have tough body scales and hard bumps all over them.

Titan Wing
Titan winged Hotburples have different shades of blue and white as well as large dark blue spots on their body. Spines run along their body lengthwise and their initially significantly clubbed tail has been reduced to a smaller tail. They have grown a lot larger and stockier in built.

Jaw Strength
Just like a Gronckles', a Hotburples' powerful jaws are able to crush boulders and iron. They are able to feed off it and use it to create a powerful lava blast.

According to Ryker, Hotburples are the only dragon species that can bite through Dragon proof metal.

Speed and Agility
The Hotburples' flying speed however, is the same with Gronckles, even though they possess larger wings.

Strength and Combat
The Hotburples' large, powerful clubbed tail can knock multiple people into unconsciousness. They are able to carry heavy Vikings with a heavy settle chair and a Rumblehorn with their claws, which means that they are stronger than Gronckles. Just like Gronckles, Hotburples can use their nose horn and their heads to charge and ram their enemies.

Durability and Stamina
With highly defensive armors on their bodies, the Hotburples' durability are greater than the Gronckles'. They have great stamina as Grump had shown to be able to travel long distances with his rider on his back.

Sleep Flight
If they get exhausted from flying, Hotburples have a special ability that allows them to continue to fly when they fall asleep. Gronckles however, tend to fall out of the sky, crashing into the ocean or the side of a mountain.

Firepower and Recharge Abilities
Just like Gronckles, Hotburples can recharge their shot limits by feeding off and digesting rocks or scrap iron before firing them as balls of molten lava. The Hotburples' high strike power rivals that of the Night Fury.

Behavior and Personality
They are much more lazy compared to Gronckles, as they sleep more and snore even louder.

They might have the personality of a really lazy cat, which is opposed to Gronckles, which have a bit of a bull dog like personality. They have a high appetite for minerals and iron, but mostly scraps. Hotburples' have a usually laid back disposition, but are not to be messed with as shown in their debut episode.

Despite this, they can be incredibly aggressive and hostile if faced with crisis. This can be displayed when Grump, the supposedly docile and tame dragon, attacked the Dragon Hunters to save Gobber.

Weaknesses
Hotburples are one of the laziest dragons known to exist, even lazier than Gronckles as Meatlug was awake for the full second movie whereas Grump was asleep for most of it. They also are very slow and clumsy, as well as frequently falling asleep. However, when sufficiently angered, a Hotburple becomes far more active and dangerous, making up for said weaknesses.

How to Train Your Dragon 2
Grump, a Hotburple, was first introduced in this film. He worked alongside Gobber in his Blacksmith Shop, keeping the forge lit with his fire. He and Gobber also accompanied Stoick and Skullcrusher on their search for Hiccup and Toothless, who were taken to Valka's Mountain by Valka.

Season 3
In Last Auction Heroes, Grump, served as  Viggo's personal garbage disposal, eating all the scrap iron at the Dragon Auctions on Auction Island until he met Gobber. He was taunted and mistreated by every man on the island, especially Ryker, who believed that he'd be more useful as food. But Gobber was quite taken with the large and ungainly dragon, showing Grump some respect for the first time in his life. His true strength and potential are revealed when he takes out two underestimating guards and frees Gobber and the Dragon Riders from a dragon-proof cage by simply biting off the door. He and Gobber then fly to Grump's new home on Berk.

Dragons: Rise of Berk
The Hotburple, along with its Titan form, appeared in Rise of Berk. Grump and an exclusive Hotburple, Basket Case, also became available in this game too.

School of Dragons
The Hotburple also became available in School of Dragons.

Trivia

 * While Gronckles like to eat any type of rocks, Hotburples prefer to eat ores of metal, such as iron.
 * It is unclear whether any other Hotburples share the half-closing eyelids of Grump.
 * It is unknown if Hotburples can blast off the bumps on their body like Gronckles.
 * It is said that the Hotburples are like a walrus, a bulldog, a tadpole, and a trash bin mixed together.