Set in the arctic / Antarctic with several different huts and a team of scientists. Slowly they get struck down by a mystery virus which turns them into monsters who's tongues shoot out even when their heads are cut off. This enables them to drag them across the floor. I saw this on TV about 25 years ago and would love to know what its called please.
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That sounds like John Carpenter's remake of The Thing, (1982).
Scientists in the Antarctic are confronted by a shape-shifting alien that assumes the appearance of the people that it kills.
There is a scene like you describe, with a severed head pulling itself along the floor with a long prehensile tongue. You can watch that clip here.