Yes, CROUPS is a Scrabble word!

Letter values in Scrabble US: C 3, R 1, O 1, U 1, P 3, S 1.

Is it a valid word?

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

a disease of infants and young children; harsh coughing and hoarseness and fever and difficult breathing
the part of an animal that corresponds to the human buttocks

Also: spasmodic laryngitis.