Yes, TATTINGS is a Scrabble word!

Letter values in Scrabble US: T 1, A 1, T 1, T 1, I 1, N 1, G 2, S 1.

Is it a valid word?

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

needlework consisting of handmade lace made by looping and knotting a single thread on a small shuttle
the act or art of making handmade lace

Also: lace making.