Madpole

Madpoles are a species of turquoise tadpoles appearing in Super Mario 3D World and Super Mario 3D World + Bowser's Fury. Their name is a combination of "mad" and "tadpole".

Madpoles are uncommon enemies that calmly swim on the water surface. If they spot Mario, they swim to him, and will keep doing so if Mario dives into the water, trying to ram him. They can be defeated by any attack. Madpoles appear in Rammerhead Reef, The Bowser Express, Deepwater Dungeon, Sprawling Savanna Rabbit Run, and Pipeline Boom Lagoon.

The Cat and Fire forms can be useful against swarms of Madpoles.

In Pipeline Boom Lagoon, Madpoles replace the Goombas in floaties and Cheep Cheeps of the original stage.

The stamp found in Deepwater Dungeon depicts a Madpole.

In the Super Mario Mash-up in Minecraft, Tadpoles are replaced by Madpoles.