From the Super Mario Wiki
Some are stationary and some jog in a set path, and they can be defeated by any attack except a jump. Spiny Skipsqueaks can also make a high hop. Spiny Skipsqueaks are found usually in groups of two or more. Spiny Skipsqueaks make their first appearance in the level Really Rolling Hills.
Additionally, Spiny Skipsqueaks appear as placeable enemies in Super Mario Maker 2 in the Super Mario 3D World style, where they jump whenever Mario jumps.
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