Yes, mounds is a Scrabble word!

Verb

1. Form into a rounded elevation

Noun

1. (baseball) the slight elevation on which the pitcher stands

2. A small natural hill

3. A collection of objects laid on top of each other

4. Structure consisting of an artificial heap or bank usually of earth or stones

5. The position on a baseball team of the player who throws the ball for a batter to try to hit