Hobgobbler

The Hobgobbler is a new dragon species that will appear in How to Train Your Dragon: The Hidden World.

Development
Hobgobblers were revealed by name at the 2018 Annecy Film Festival preview of How to Train Your Dragon: The Hidden World. They were pictured and mentioned again by Dean DeBlois on a Twitter post.

Hatchling to Adult
Hobgobblers are small, plump dragons with a rounded appearance, a single nasal horn, and small spines on their back. Their mouth takes up a large amount of their physical size. Dean DeBlois describes them as looking like "a beachball" and "little round dragon that's sort of a cross between a bull frog and a French bulldog".

Behavior and Personality
Though not specifically stated, based on its impish name, the Hobgobbler may have a mischievous nature. An individual is also seen bathing in the community soup, which is frowned upon. Dean DeBlois also indicated that Gobber the Belch, a seasoned Viking warrior, is "terrified" of the Hobgobbler, lending credence to possible mischievous antics.

How to Train Your Dragon: The Hidden World
The Dragon Riders rescue a trapped Hob Gobbler on one of their rescue missions and brings it back to Berk.

Later on, the Hobgobbler somehow ends up swimming in a cauldron of soup that has been placed within the Great Hall, and its appearance startles Gobber, who deems it "unsanitary".

Trivia

 * According to the Urban Dictionary, the Hob Gobbler is a creature from Appalachia folklore that grants wishes as well as plays tricks on humans. It also can turn into a turkey.
 * The name "Hobgobbler" may also be derived from a type of fairy or goblin from folklore of the British Isles called a Hobgoblin. This spirit or creature resided in homes and was helpful to the resident family, but could also wreak havoc if they were offended. Though the hobgoblin is not specifically mentioned, elves and fairyfolk and other such beings do figure in Norse Mythology.