Two-Headed Gormatrons are a species of dragon that sided with humans during the dragon Rebellion. Its possible this dragon inspired the Hideous Zippleback seen in the Franchise.
Traits and Abilities
Like the name suggests, Two-Headed Gormatrons have two heads. One would think they would have an intellectual advantage over other dragons because of that, but alas they do not. The two heads can be at odds with each other and can spend days trying to go separate ways. This indecision could leave these dragons vulnerable, yet they still survive, possible because they don't smell very good or taste very good. They are also said to be not very smart.
- The Complete Book of Dragons: A Guide To Dragon Species, Cressida Cowell. 2014