no
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Yes.
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.
Quadrilaterals, pentagons, triangles, octagons, hexagons, decagons.
Strictly speaking, no, because a semi-regular tessellation must be based on regular polygons and rhombi are not regular polygons. However, octagons and rhombi can be used to make a non-regular tessellation.
They are both polygons whose exterior angles add up to 360 degrees.