Yes, CAROB is a Scrabble word!

Letter values in Scrabble US: C 3, A 1, R 1, O 1, B 3.

Is it a valid word?

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

long pod containing small beans and sweetish edible pulp; used as animal feed and source of a chocolate substitute
evergreen Mediterranean tree with edible pods; the biblical carob
powder from the ground seeds and pods of the carob tree; used as a chocolate substitute

Also: carob bean, algarroba bean, locust bean, locust pod, carob tree, carob bean tree, ceratonia siliqua, carob powder, saint-john's-bread.