Yes, SPONGERS is a Scrabble word!

Letter values in Scrabble US: S 1, P 3, O 1, N 1, G 2, E 1, R 1, S 1.

Is it a valid word?

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

a workman employed to collect sponges
a follower who hangs around a host (without benefit to the host) in hope of gain or advantage