Gargantuan Frog

This is the mini boss in the Lakebed Temple in Twilight Princess. It has eggs on its back that release tadpoles to make the battle more difficult. Link must toss a bomb into its mouth once it opens it, and that will bring the frog down and expose its vulnerable tongue. Slashing the tounge and then repeating the whole process a few more times earns Link the Clawshot.