Greyfrog was a demon who was born of Mirepool’s Clutch in the Twentieth Season of Darkness. By his own admission, he had fathered thirty-one clutches of his own. Greyfrog, dog-sized and reptilian in general appearance, had a broad face and mouth with two slitted nostrils, four arms with clawed apelike hands, and two legs. His four eyes, with vertical pupils, were arranged in a diamond pattern in his flat, hairless head.
Greyfrog accompanied Cutter, Felisin Younger, Scillara and Heboric Ghost Hands on their journey to Otataral Island. He communicated telepathically with his travelling companions with the exception of Scillara. It turned out that the reason was her pregnancy. Once she delivered the baby, he also communicated with her and displayed a certain affection for her.
- "The demon’s appetite was voracious, and L'oric admired its single-mindedness, if not its rather untidy approach to eating."
- ―L'oric's thoughts while Greyfrog ate breakfast