Bigocto is the sub boss of the third dungeon Jabu Jabu’s Belly in The Legend of Zelda: Ocarina of Time. Not a bad sub boss, I will say.

He’s also basically the giant version of a regular enemy.

But that matters little when you have spikes that trap you and a giant monster trying to get at you.

For which you have to use some trickery to get around them and attack his weakness at his backside.