Blue-tongued skinks love sweet fruits, and grapes are generally safe for them to eat in small amounts. However, there are some things to keep in mind when feeding grapes to your skink, such as the oxalate content and sugar content.
Lizards such as iguanas and bearded dragons can eat human food, but not chocolate. Chocolate contains theobromine, a chemical that is toxic to animals, especially those with slow metabolisms like reptiles. Although some lizards may enjoy chocolate, it is not worth the risk as it can lead to health complications and even death.