Snapper (Majora's Mask)

Snappers are enemies from The Legend of Zelda: Majora's Mask. Large, spiky turtles, Snappers appear as enemies in both the Woods of Mystery and the Woodfall Temple, in which one appears as a mini-boss with a Gekko. Snappers attack Link by withdrawing into their thick shells and spinning at him with their spikes out. Their only weak spot is their soft underbelly, and Link can employ a variety of methods to flip them over.

Link can lay a bomb near the Snapper, explode the Blast Mask near it, use the Deku Mask and bury himself within a flower, launching himself out when the Snapper passes over the flower, or use the Goron Mask's Ground Pound attack to flip it over. After this, he can strike its underbelly with his sword. In the Woodfall Temple's mini-boss battle, the Gekko summons a larger Snapper that can only be flipped over by using the aforementioned Deku Mask method. Once Link has done this, the Gekko will fall off of the Snapper and Link can damage it.

Etymology
Snappers are presumably named after snapping turtles.