Yoshi and Toad are in the unfortunate situation of being both the name of a single character and a species. Just like Pikachu, Jigglypuff, and every other Pokémon to appear in SSB.
There are examples in the Mario series too, including Koopa Troopa, Para Troopa, Lakitu, Wiggler, Boo, Shy Guy.. there may be some others but that's all I can think of..