Alligatiger

Alligatiger

Dragon Initiation Program
Though not specifically mentioned, as one of the Hairy Hooligan Viking novice's hunting dragon, its was most likely captured from the Dragon Nursery during Dragon Catching Day.

Later, Alligatiger is mentioned as a participant in the Final Initiation Test on Thor'sday Thursday. It partakes of the uncontrollable all-out dragon brawl that breaks out during the test, causing all the Hooligan and Meathead initiates to be exiled for being unable to control their dragons.

"Toothless was in his element in this kind of chaos, dodging Fireworm's angry lunges with ease, nipping in with a lively bite at Alligatiger here and a scratch at Brightclaw there, obviously enjoying the fight enormously."

- Book 1

Physical Appearance
Alligatiger is mentioned in name only; no description of its gender or species is given. We do know that it is a Hunting dragon, so most likely the size of a medium to large Dog.

There are a few Hunting dragon species mentioned but not seen on the How to Train Your Dragon Book Website - the Eaglefly and the Dimbruiser. It is possible Alligatiger is one of these species, as they are also not described, but are known hunting dragon species. A Slitherwing is also possible.