A person who makes faces all day could be referred to as a "facial contortionist" or simply as someone who is "making faces." This behavior could also be described as "grimacing" or "mimicking expressions." It is important to consider the context in which the person is making faces to determine the most appropriate term to use.
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Oh, dude, you call them a professional emoji impersonator. Like, seriously, they're like the human version of those little yellow faces we all use in texts. I mean, if they're making faces all day, might as well get paid for it, right?
a clockmaker
You're an octagon.
A cube has three pairs of parallel faces and all faces are congruent.
A cube does
It has six faces.
All faces of a cube are squares. A cuboid has 4 or 6 rectangular faces.