The Hairy Hooligans are a viking tribe that lives on the Isle of Berk. Their chief is Stoick the Vast, and they are the central tribe in both the How to Train Your Dragon book and film. Hiccup, Fishlegs, Astrid, and other Vikings they interact with belong to the Hairy Hooligans.
In the Book
Unlike the movie, the Hairy Hooligans have always trained dragons and kept them as pets.In fact, to be an official member of the tribe, one must find a dragon, capture it, and train it. Strangely, almost the entire population of the Hooligan tribe appears to be men and boys, with the only woman mentioned being Stoick's wife, the great quester Valhallarama. Hypothetically, there must be more women, or they would not be able to keep their population up.
In the Film
The Hairy Hooligans are constantly fighting with the dragons of the area that provide for the Red Death. The dragons steal the food of theHooligans in order to appease the Red Death. Following the demise of it, the Hairy Hooligans establish a symbiotic relationship with the dragons, living in harmony and riding on them.