A two sided polygon is called a bigon, and it exists in spherical geometry.
(the previous answerer said this: "a polygon has 3 or more sides retard idiot so how stupid can you be a polygon can not have 2 sides dumb*ss" - and I would advise him/her to shout at the mirror next time)
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A five sided polygon is called a pentagon because pentagon means five sided polygon I think.
A 12-sided polygon is called a dodecagon.
A million-sided polygon is called a megagon.
A 20-sided polygon is called an icosagon.
A 90-sided polygon is called an enneacontagon.