Ham (also called "Turkey Leg" in some parts of the game) is an item used to get energy. It gives 1 energy.

Ham is won often, from the Tavern, Daily Tasks, Crown Port (Ports), killing a Treasure Hunter, Reward Center and Online Reward. You can count on getting 8 to 10 of them each day. You should use them, since they only stack until 30 on the Inventory. It will be useful for getting Level Taxes.