From the Super Mario Wiki, the Mario encyclopedia
A Swinging Claw is an object in Super Mario Maker 2 that can grab enemies and items. When Mario approaches one, it drops whatever object it is holding. Swinging Claws can be placed on tracks, and they can even be used to swing Mario. If the player is in a Swinging Claw's grasp, they can move left and right to build momentum before jumping out of it to gain more distance. In the Super Mario Bros. and Super Mario World styles, they are depicted as generic claws, while in the Super Mario Bros. 3 and New Super Mario Bros. U styles, they are depicted as sentient claws with a face. The player can also press or while pressing to drop out of the claw.
Super Mario Maker 2
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