The phrase "oval ball" refers to a type of ball that is shaped like an egg. It is commonly used in sports like rugby and American football, where players use their hands to pass and kick it.
When all the balls are rolled out, use your scissors to cut two ears out of the oval ball as shown in the picture. (gayathriscookspot.com)
5 Shape the squash into 12 quenelles (oval balls) by dipping 2 tablespoons in warm water, and moulding a generous spoonful of squash between them. (theguardian.com)