Fofo

Fofo is an Anouki who lives in the Anouki Estates on the Isle of Frost in The Legend of Zelda: Phantom Hourglass. He is among those Link questions while searching for a Yook who has abducted and impersonated one of the Anouki villagers. Fofo tells Link that he and Gumo never lie, so therefore neither of them can be the Yook. Gumo, on the other hand, isn't so sure, and tells Link that either Fofo or Aroo is the liar.

As it turns out, Fofo is innocent.