Play football (soccer) with greylings or necks as the ball. Or boxing with them as the bag.

Trap greylings, necks, and/or boars in huts and place a workbench nearby so they won't despawn.

Use the harpoon to take deer for a swim, or on anything that moves.

Make a neck pit and trap as many necks as you can. Make sure to place a workbench so they won't despawn.