FROGO "STUBS" GURBLE

Frogo "Stubs" Gurble was a deceitful grue and author of the book "Grues: Another Look," published sometime prior to 1066 GUE. Intended for a human audience, he purposely misled adventurers by advising in it, that the best thing to do when grues were approaching was to become still and silent.

SOURCE(S): Zork: The Undiscovered Underground