Yes, GEODUCKS is a Scrabble word!

Letter values in Scrabble US: G 2, E 1, O 1, D 2, U 1, C 3, K 5, S 1.

Is it a valid word?

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

a large edible clam found burrowing deeply in sandy mud along the Pacific coast of North America; weighs up to six pounds; has siphons that can extend to several feet and cannot be withdrawn into the shell