A cloud who looks like marshmallows who thinks he's a frog.
Marshmallow Guy (often incorrectly referred to as Mallow), was actually a cloud in Super Mario GPR: Legend of the Seven Stamps who believed that he was a frog. When Square Enix quit working for Nintendo, they took the Marshmallow Guy with them and locked him in a closet. Marshmallow Guy didn't come out of the closet for twenty years, and when he did, he got kidnaped by the Rare people, and they locked him in a closet with Banjo, who later ate him. It is not to be confused with Marshmallow in Super Nintendo Bros. Brawl.