Yes, BOLLOCKS is a Scrabble word!

Letter values in Scrabble US: B 3, O 1, L 1, L 1, O 1, C 3, K 5, S 1.

Is it a valid word?

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

one of the two male reproductive glands that produce spermatozoa and secrete androgens
a pulley-block at the head of a topmast

Also: bullock block, botch up, screw up, ball up, muck up, bollix up, bollocks up, louse up, foul up, mess up, fuck up.

Not playable in Scrabble US: BALLOCK, BOLLOCK, BODGE.