This may sound funny, but it is actually called a 100-agon.
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The name of a 100 sided polygon is Hectogon.
A 100-sided polygon
It can be but it also could be an irregular polygon
A Heptagon is a 7 sided polygon. A Hectagon is a 100 sided polygon. The spell check says it's not spelled correctly, but it is.
You could just call it a 100-gon. In English there's no word for a 100 sided polygon. in Latin, it would be centagon, using the prefix -centa meaning 100.