Rumblehorn

The Rumblehorn is a new dragon species that appeared in the movie, How To Train Your Dragon 2.

Dragon Appearance
The Rumblehorn has relatively large wings, a wide torso, and a tail with a club-like hammer on the tip. Its most notable feature is the heavily armed front half of its body with firm armor plates on the neck and a large lower jaw, a battle axe-shaped muzzle, which is always digging in the dirt, looking for scents, and two, very sharp, elongated horns resembling those of ceratopsian dinosaurs, but lacking a beak. The Rumblehorn has a very acute sense of smell, and is determined to track down and find anything once it has picked up the scent. In total, they look like a mix of truffle pig, a rhinoceros, a battle axe, and a scarab beetle.

Abilities
It can shoot long-ranged fire "missiles" from its mouth which initially starts out as a white-hot fireball that quickly solidifies and turns to a warmer color before it ends up in a sooty, stony material when it hits its target.

Being a Tracker Class dragon, their powerful sense of smell are able to find any Viking scent from long distances even if the material that worn from the water for certain period of time.

Their strength have also been shown by Skullcrusher when he can hold heavy Vikings and their weapons. They have a powerful long tail that can be used as a club.

Trivia

 * A Rumblehorn named Skullcrusher is the new dragon of Stoick the Vast in the second film and later Eret at the end of the second movie
 * The Rumblehorn shares similar body structures with the Triceratops, rhinocerous, truffle pig, and dung beetle.
 * It's lower jaw seems to have been originally able to go two ways, as evidenced by a piece of concept art.
 * The Rumblehorn also appears in the game School of Dragons.