Does the tongue constantly move?

Much of your brain is devoted to your tongue. It is a huge muscle, constantly moving, that has to keep out of the way of your teeth, help you swallow and avoid choking you. It's covered with densely packed touch receptors that constantly update the mental map of the shape of your mouth.

Is it possible to not move your tongue?

Tongue movement problems are most often caused by nerve damage. Rarely, problems moving the tongue may also be caused by a disorder where the band of tissue that attaches the tongue to the floor of the mouth is too short. This is called ankyloglossia.