Cactus Jack

Cactus Jacks are large, spike covered Pokeys with targets on their chests. They can only be moved by being shot by an Egg. If they come into contact with anything when rolling they'll explode and shoot out coins. Cactus Jacks appear only in Super Mario World 2: Yoshi's Island.

They are a pale sub-species of Needlenoses.

Trivia

 * Cactus Jacks are named after politician John "Cactus Jack" Garner. There is a rumor that they were named after a pro wrestler who used to go under that name.