Well, to be fair, it is a Gnoll Vampire, which isn't exactly the same thing. Makes more sense for an undead creature to live in Icewind Dale than just a normal Gnoll.Gnolls, in the arctic Icewind Dales!
There's an entire Gnoll clan in a cave in RotFM.Well, to be fair, it is a Gnoll Vampire, which isn't exactly the same thing. Makes more sense for an undead creature to live in Icewind Dale than just a normal Gnoll.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.