Yes, WHITINGS is a Scrabble word!

Letter values in Scrabble US: W 4, H 4, I 1, T 1, I 1, N 1, G 2, S 1.

Is it a valid word?

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

flesh of a cod-like fish of the Atlantic waters of Europe
flesh of any of a number of slender food fishes especially of Atlantic coasts of North America
a small fish of the genus Sillago; excellent food fish
any of several food fishes of North American coastal waters
found off Atlantic coast of North America
a food fish of the Atlantic waters of Europe resembling the cod; sometimes placed in genus Gadus

Also: silver hake, merluccius bilinearis, merlangus merlangus, gadus merlangus.