Wart
Wart is a Mini-Boss in Majora's Mask. It is one huge eye that rolls around trying to hit you. It is surrounded by a mass of bubbles. You can either pull the bubbles towards you with the Hookshot and slash them or shoot them with Fire Arrows, which consumes a lot of magic power and is unnecessary. After you have destroyed all the bubbles, shoot its eye with arrows.
Wart is officialy a character from Super Mario Brothers 2:Doki Doki Panic. However, he don't look like he did in Majora's Mask. He was a big, frog with round eyes, a crown and a rob. He also did an appearance in A Link to the past!