Frog

Frogs are a species of animals that first appeared in Super Mario World 2: Yoshi's Island, however they are named Frog Pirates.

In the Mushroom World, there is a pond inhabited by large, anthropomorphic, sapient Frogs in the duration of Super Mario RPG: Legend of the Seven Stars,  Mallow was raised by the Frogs, specifically Frogfucius and believed that he, himself, was a Froggy as well. The young tadpoles comprise a greater part of the population than the Frogs, of which there are only two.

Frogs also appeared as enemies in Yoshi's Story during Stage 4-4: Neuron Jungle. They swarm any Yoshi crossing the lagoon. Although any Yoshi could eat them, Green Yoshi liked them best.

Wart from Super Mario Bros. 2, is a frog.

In Super Mario Bros. 3, there is a Frog Suit that allows Mario to become Frog Mario. Luigi can also become Frog Luigi.