A dream with a tongue symbolizes the way you go about expressing yourself. The dream can imply that you are looking at the way you communicate with other people.
If your tongue is cut off then it suggests that you need to listen more to others when they speak or express yourself in a different way when communicating.
If you bite your tongue then it implies that you feel people or someone is dominating the conversation in your waking life and you are not being able to put your views across properly.
To see a tongue out or wiggling can mean you tend to dominate the conversation or talk too much about others.