Gekko

A Gekko is a possessed frog-like mini-boss that guards two of four temples in Majora's Mask.

Strategy
Two Gekko frogs are fought in-game. The first one is found in Woodfall Temple. It rides on the back of a giant Snapper and once it is knocked off, it will run along the walls and ceiling of the room. Link must shoot it with his bow in order to weaken it. Gekko will then hop back on the back of the Snapper until Link knocks it off again.

The second Gekko, is found in the Great Bay Temple, and wanders along the ground amongst a group of Mad Jelly, occasionally throwing one at Link. When attacked, it will bound toward the ceiling as all of the Mad Jelly collects into a single mass, encasing the Gekko. A simple Ice Arrow will freeze him inside, sending the Gekko sailing down to the floor. If Link fails to shoot the Gekko, or gets to close to the Mad Jelly blob, he will be trapped inside. The Gekko will then punch Link repeatedly causing damage. It then finishes it off with a mighty left hook, that breaks Link through the bubble, causing serious damage.

After Link defeats each of the amphibious creatures, they will turn into one of the five frogs from Don Gero's Frog Choir.

Trivia

 * The Chu Worms, which appear in the Lakebed Temple and the Cave of Ordeals in Twilight Princess, is similar in some way to the Gekko and Mad Jelly.
 * Though a Gekko's name would suggest that is a reptile, it bears more resemblance to a frog.
 * Because the Gekko does not resemble its real-life namesake and because its name is only used scientifically, it may actually be a reference to the Nintendo GameCube's CPU, which shares its name with the enemy. This is possible because the GameCube was in development during the same period as Majora's Mask was.