Yes, POLECAT is a Scrabble word!

Letter values in Scrabble US: P 3, O 1, L 1, E 1, C 3, A 1, T 1.

Is it a valid word?

POLECAT is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

American musteline mammal typically ejecting an intensely malodorous fluid when startled; in some classifications put in a separate subfamily Mephitinae
dark brown mustelid of woodlands of Eurasia that gives off an unpleasant odor when threatened

Also: wood pussy, mustela putorius.

Not playable in Scrabble US: FOULMART, FOUMART.