Theory: Toads and Shelltops are related

Abstract
Shelltops and Toads are related species

Arguments

 * Argument 1: Shelltops and Toads have near-identical appearances. They stand at the same height, wear the same kinds of shoes and have the same faces. They also both have multiple colors and can grow facial hair.


 * Arguments 2: The one difference between Shelltops and Toads is that the former have shells for heads and the latter have mushroom caps for heads. However it has been stated that the Toads themselves are not Mushrooms and their Mushroom Caps are not part of their bone structure, meaning a related species could quite easily have something else, such as a shell, growing out of their heads instead.