Yes, COCOS is a Scrabble word!

Letter values in Scrabble US: C 3, O 1, C 3, O 1, S 1.

Is it a valid word?

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

coconut palms
tall palm tree bearing coconuts as fruits; widely planted throughout the tropics

Also: genus cocos, coconut palm, coco palm, cocoa palm, coconut tree, cocos nucifera.