Yes, FERRETS is a Scrabble word!

Letter values in Scrabble US: F 4, E 1, R 1, R 1, E 1, T 1, S 1.

Is it a valid word?

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

musteline mammal of prairie regions of United States; nearly extinct
domesticated albino variety of the European polecat bred for hunting rats and rabbits

Also: black-footed ferret, mustela nigripes, ferret out.