Hendecagon or undecagon
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Yes there is an eleven sided polygon. It is known as a Undecagon or Hendecagon.
It is simply a polygon with all equal angles. It is not a regular polygon - if that is what you are looking for.
An eleven-sided polygon is a hendecagon.
A polygon with all interior angles congruent Is known as a regular polygon.
A polygon has as many angles as sides, so a polygon with 10 sides (decagon) would have 10 angles.