Snaggletooth (Books)

"'''My aunt Snaggletooth died of Vorpentitis, and it's a nasty way to go."

- One Eye in Book 4

Snaggletooth is a dragon mentioned in How to Cheat a Dragon's Curse in the How to Train Your Dragon Book series.

Death
Snaggletooth's nephew, One Eye, tells the story that she died of Vorpentitis, an unpleasant illness afflicting both humans and dragons. It is caused by the sting of a Venomous Vorpent. Her death from this disease inspired One Eye to help Hiccup in his quest for a cure, despite his animosity toward humans.

Physical Appearance
Though no description is given for Snaggletooth, she is a Sabre-Tooth Driver Dragon and therefore most likely white in color with long fangs, as with others of her species.