Yes, SEAFOWL is a Scrabble word!

Letter values in Scrabble US: S 1, E 1, A 1, F 4, O 1, W 4, L 1.

Is it a valid word?

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

a bird that frequents coastal waters and the open ocean: gulls; pelicans; gannets; cormorants; albatrosses; petrels; etc.

Also: sea bird.