From the Super Mario Wiki
Cactus Jacks are large, spike covered Pokeys with targets on their chests. They can only be moved by being shot by an Yoshi Egg. If they come into contact with anything when rolling, they explode and shoot out coins. Cactus Jacks appear only in Super Mario World 2: Yoshi's Island and its remake Yoshi's Island: Super Mario Advance 3.
They are a paler sub-species of Needlenoses.
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