Yes, PORK is a Scrabble word!

Letter values in Scrabble US: P 3, O 1, R 1, K 5.

Is it a valid word?

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

meat from a domestic hog or pig
a legislative appropriation designed to ingratiate legislators with their constituents

Also: pork barrel.

Not playable in Scrabble US: PORC.