Yes, FREEST is a Scrabble word!

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

Is it a valid word?

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

able to act at will; not hampered; not under compulsion or restraint
unconstrained or not chemically bound in a molecule or not fixed and capable of relatively unrestricted motion
costing nothing
not occupied or in use
not fixed in position
not held in servitude
not taken up by scheduled activities
completely wanting or lacking
not literal