Piranha Plants

Ptooies are Piranha Plants with the ability to walk. They are Piranha Plants with the ability to shoot spiky balls out of their mouth and are usually very minor antagonists.

Super Mario Bros. 3
Ptooies make their first debut in Super Mario Bros 3. They shoot their balls out of their mouths. If Mario is on a higher platform, the Ptooie will launch its ball higher to deal damage. They can be destroyed with fireballs, hammers, a Koopa shell, or Starman.

The Adventures of Super Mario Bros. 3
Ptooies make a few appearances in the DiC cartoon. They would shoot balls at Mario, Luigi, Princess Peach, or Toad. They could shoot a whole barrage of spike balls at their enemies. They are also capable of speaking to Bowser.

Super Princess Peach
Ptooies later appear in Super Princess Peach. Their manners are the same and pounding will cause it to lose its ball. The Ptooie cannot be stomped. They are also followed by a variant called a Glad Ptooie which jumps into the air.

Similar Enemies
There are two enemies similar to the Ptooie in New Super Mario Bros. Wii:

Stalking Piranha Plants
The Stalking Piranha Plant is a similar enemy to the Ptooie. When Mario isn't around, they walk like Ptooie. When approaching them, they will try to attack Mario. They can be defeated by a fireball, being frozen, or a Starman.

River Piranha Plants
The River Piranha Plant has also the same tactics of a Ptooie. It sucks the ball right into its mouth after launching it then launching it again. They can be defeated by fireballs or a Starman.