Yes, CHINCHILLAS is a Scrabble word!

Letter values in Scrabble US: C 3, H 4, I 1, N 1, C 3, H 4, I 1, L 1, L 1, A 1, S 1.

Is it a valid word?

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

the expensive silvery grey fur of the chinchilla
a thick twilled fabric of wool and cotton
small rodent with soft pearly grey fur; native to the Andes but bred in captivity for fur

Also: chinchilla laniger.