From the Super Mario Wiki
This enemy is known to be a risk to players. Players should be careful when fighting this enemy.
Fizzlits are small purple blob-like enemies that first appeared in Super Mario Galaxy 2 where they have a tooth-shaped body. They mainly attack by generating an electric puddle around themselves, which will electrocute and damage the player(s) if he or she tries to attack them. However, Fizzlits will only be vulnerable to any of the player's attack when they are in their normal form. In addition, Fizzlits are able to jump around before creating their electric puddles.
In order to defeat Fizzlits, Mario must wait when they stop electrifying to protect themselves from any attack. They can also be defeated with Yoshi's tongue.
Warning: Do NOT attempt to attack these foes with Yoshi's tongue whilst in electricity. This will cause Yoshi to hide in his egg. Here is an example of what happens when Fizzlits are attacked, electrocution.
Fizzlits reappear in Super Mario 3D World. They are now square-shaped and still retain the same method of attack from before: generating an electric puddle in an attempt to damage players. However, Fizzlits are unable to jump around and will only move sideways when attacking. The puddle they melt into is now square, and their entire faces can be seen on top of the puddle, rather than their eyes poking out as they did in their previous appearance.
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