Blockhoppers are enemies that only appear in the game New Super Mario Bros. It is possible that they can be defeated by a Koopa's shell, Ground Pounding or using the Shell Dash ability with the Spiny Shell.
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They're Top Half is composed of 2 Bricks while their Body is a ? Block, they also wear Blue Mario-like Boots, and hidden between the Blocks they have green eyes and black skin (though it's possible their skin is being shadowed by the blocks)