I disagree when people consider balls like Rugby and Footballs as Eggs cause people consider most balls as Spherical
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When you examine the many descendants of medieval village football, you will find that the majority of them use a prolate spheroid shaped ball. This includes not just American football, but also Australian rules football, rugby league, and rugby union, each of which utilize balls that are of varying shape. In the category of ball-field-and-goal sports, only soccer and Gaelic Athletic Association (GAA) use a round ball.
The general rule of thumb is that sports that are less focused on hand use tend to have rounder balls, such as foot-the-ball type sports, racket sports, bat sports, and club sports. This is because they need round balls to function properly.
It is important to note that the original ball used in the game was an inflated pig's bladder, which would have been far from round. The round shape of a ball is actually an exception, as the natural shape of a ball is prolate. If you want to verify this, simply check the shape of your own testicles (for men only, and privately if you are a gentleman). If they are prolate, then they are the natural shape of a ball. If they are round, it is recommended that you seek medical attention immediately.