Yes, QUOITS is a Scrabble word!

Letter values in Scrabble US: Q 10, U 1, O 1, I 1, T 1, S 1.

Is it a valid word?

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

a game in which iron rings (or open iron rings) are thrown at a stake in the ground in the hope of encircling it
game equipment consisting of a ring of iron or circle of rope used in playing the game of quoits