Yes, JACKSTRAWS is a Scrabble word!

Letter values in Scrabble US: J 8, A 1, C 3, K 5, S 1, T 1, R 1, A 1, W 4, S 1.

Is it a valid word?

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

a game in which players try to pick each jackstraw (or spillikin) off of a pile without moving any of the others
a thin strip of wood used in playing the game of jackstraws