I have used tennis balls with DD for OF practice. Put cones on field and yelled to her which cone to throw it to. She just had to make a half hearted throw to cone, worried she would blow her arm out throwing full speed.
Never for the infield. Put something on first, hit real balls to her and her goal was to catch and hit the target. Being a mean dad some balls were unreachable for her to see what she could do.
I have done some strange things but never golf balls.