Limta

The limpta is a light weight frog on the milk planet that is yellow and can jump around on butter without sinking into it, it eats bugs that fly around and lays eggs that eventually turn into tadpoles.

The problem with the limta tadpoles though, is that they can not swim in milk. While they are able to swim in milk later in their life, they cannot lay eggs in the milk because the tadpoles require melted butter ponds to live in, and these butter ponds are in minimal amount because the climate is so cold.