Yes, CALVES is a Scrabble word!

Letter values in Scrabble US: C 3, A 1, L 1, V 4, E 1, S 1.

Is it a valid word?

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

young of domestic cattle
the muscular back part of the shank
fine leather from the skin of a calf
young of various large placental mammals e.g. whale or giraffe or elephant or buffalo

Also: break up, have young.