Yes.
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There are pentagons, hexagons, heptagons, octagons, et cetera.
no
That is because an octagon is singular and polygons is plural. An octagon is a polygon, and octagons are polygons but a octagon cannot be a polygons.
All seven sided polygons are known as "heptagons". Heptagons that have all side lengths the same are known as "regular heptagons".
Quadrilaterals, pentagons, triangles, octagons, hexagons, decagons.