Question

Can polygons have rounded edges

Answer 1

I don't thinks so, since the definition of a polygon is a shape that is closed and only has straight lines, so no curves. Squares and rectangles, and hexagons, and octagons, etc, are polygons, while ovals and circles, etc are not polygons. 

Answer 2

A polygon is a figure formed by coplanar segments.

The segments of the polygon are called sides.

Polygons can't have round edges that make a part of the figure.

They can only have line segments.