Mamu

Mamu is a frog-like creature from Link's Awakening. He teaches Link the third and final song for the Ocarina, the "Frog's Song of Soul". Mamu resides in the pond beneath the Signpost Maze. After paying the 300 Rupees fee to listen to his jam, Link will learn the "Frog Song of Soul". Mamu remarks that the ones who hear the song feel more alive. Mamu cannot be revisited as he and his Frog Choir are away on tour according to the sign outside the pond.

Origins
Mamu is a cameo character who originates in another game, ' ('). He was the main villain in the original game where he is the ruler of a storybook world and he sets the events of the game in motion by kidnapping two children and bringing them to his dream factory. The game was localized outside of Japan as with Super Mario Bros. characters replacing the original Arabian Nights inspired characters. The US localization changed his name to and instead, he is the ruler of the dream realm Subcon. In Link's Awakening he retains his original Japanese name, Mamu, in the English localization.