Yes, PUDDINGS is a Scrabble word!

Letter values in Scrabble US: P 3, U 1, D 2, D 2, I 1, N 1, G 2, S 1.

Is it a valid word?

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

any of various soft thick unsweetened baked dishes
(British) the dessert course of a meal (`pud' is used informally)
any of various soft sweet desserts thickened usually with flour and baked or boiled or steamed