I believe you're referring to the Jib-Jib, a creature indigenous to the Low Xamen area in Kakhabad. Jib-Jibs are essentially walking hairballs with a STAMINA of 1 and ear-shattering cries. To the best of my recall, they've surfaced in Sorcery! Book 1 and Fighting Fantasy Book 29: Midnight Rogue - in both instances as walking alarm systems who have to be killed in one Attack Round.

Insert gratuitous pop culture trivia: Jub Jub is the name of Selma Bouvier's giant iguana.