Hookfang is the hot headed dragon of Snotlout. He is a Monsterous Nightmare, and is just like his master, hot headed, short tempered, etc. He does not like taking orders from Snotlout as seen in several episodes. When Snotlout first met Hookfang in "How to Train your Dragon" he did not fully trust vikings. Now, however, he fully trusts them.Edit
It is shown he has a rivalry with Barf and Belch.