Yes, MORELLO is a Scrabble word!

Letter values in Scrabble US: M 3, O 1, R 1, E 1, L 1, L 1, O 1.

Is it a valid word?

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

any of several cultivated sour cherry trees bearing fruit with dark skin and juice
cultivated sour cherry with dark-colored skin and juice

Also: prunus cerasus austera.