The opposite of "hand egg" is not "foot egg".

And the point is that the object played in "American Football" is not a ball. Balls are round. It is egg shaped. The object played in "Football" is a ball. Describing the ball in football as an egg just makes you look like you can't see properly.

i get it, it’s not the canonical “egg shape”, but many eggs (fish/frogs/etc) are spherical.