Yes, ALGARROBA is a Scrabble word!

Letter values in Scrabble US: A 1, L 1, G 2, A 1, R 1, R 1, O 1, B 3, A 1.

Is it a valid word?

ALGARROBA 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
mesquite pod used in tanning and dyeing
mesquite of Gulf Coast and Caribbean Islands from Mexico to Venezuela

Also: carob bean, algarroba bean, locust bean, locust pod, carob tree, carob bean tree, ceratonia siliqua, prosopis juliflora, prosopis juliiflora.

Not playable in Scrabble US: ALGARROBILLA, ALGAROBILLA.