Rolling Toy Block
From the Super Mario Wiki
The Rolling Toy Block is an object found in the Game Boy Advance game Wario Land 4. The Rolling Toy Block is a mobile platform type item that Wario can ram to move along to an area where he can stand on top of it, in order to reach otherwise inaccessible places to grab coins or Diamonds. The Rolling Toy Block is a circular shaped block that is red with stripes. The only stage that Rolling Toy Blocks can be found on is Toy Block Tower in the Topaz Passage.