From the Super Mario Wiki, the Mario encyclopedia
Floating Faces are large ball-like floating faces with a mustache. They bear a resemblance to Wario. They are found in Mario's castle in Super Mario Land 2: 6 Golden Coins. They bounce around a small room at diagonal angles. They can be killed by jumping on them twice (once on the Easy difficulty). Mario can also destroy them by a single spin jump, regardless of the difficulty level. They appear in a total of three rooms consecutively, with the first room containing one and the latter containing two each. They are the last defense barrier before Mario can finally face Wario.
Names in other languages