From the Super Mario Wiki
Fake Blocks are enemies appearing in Super Mario 3D Land. They are dark brown Brick Blocks with white eyes representing an angry face much like a Spiny and a Tanooki tail.
Fake Blocks appear in plain grasslands and Airship levels. They appear along regular Brick Blocks and are noticeable by their darker tone. If Mario or Luigi gets close, it will reveal its eyes and Tanooki tail and will follow the character. They can be defeated with the swing of a Tanooki tail, a ground pound, or by jumping up and breaking the block, though the latter only works when it is not active.
Names in other languages
||Pun on falso (false) and bloque (block)
- In Super Mario 3D Land, Fake Blocks are darker than Brick Blocks, but in the game cover artwork, they are the same color.
- Their jump attacks are almost identical to the Pile Driver Micro-Goombas. Also, the two can be easily distinguished from the inanimate Brick Blocks.