No! Guinea pigs cannot eat turkey at all for two reasons. One is that guinea pigs cannot eat meat at all and secondly because it is cooked.
I know it may be tempting during the holidays to want to give leftover turkey to your pets but you definitely cannot give turkey to your guinea pig.
You will make your guinea pig sick and possibly cause other health concerns for your pet.
If you want your guinea pig to join in on the holiday food fun then give them some fresh raw veggies that they can safely nibble on instead.