Splounder

Splounders are flounder-like enemies that first appear in Super Mario 3D World. They are present in every Plessie-themed level, with the exception of Deepwater Dungeon. Splounders will either move side to side or remain stationary. They can be defeated by any attack, and will be stunned if Plessie bumps into them. Jumping on a Splounder can provide a very decent bounce, and can sometimes even lead to Plessie reaching previously inaccessible areas.