Chicken Wing is an item used to grant 30 Energy. It's also called "Turkey" on some places of the game. Do not confuse with Ham, which is also called "Turkey Leg"
It can be gained from the Tavern, a few from the Daily Grind event, other events and Daily Login Reward.
The main source is buying them on the marketplace, but you can buy at most 4 each day (VIP 5 doubles this amount)