I have a few ground pounder targets, but I tie them to a stick that is nailed to the top of the berm, so they are hanging in front of the berm. When hit they spin, swing, jump, or fall to the ground when you cut the rope. All are on different lengths, different sizes/shapes.
Favorite yet is a 2x4 planted in the ground with 3" finnish nails up both sides. 1 russett potato each nail, first one to the top wins. 1 shot each turn, must clean the whole potato from the nail before advancing to the next spud. Shoot one out of order, lose a turn. And with loads of trash talk.
Nuthin wrong with clay pigeons either.