Yes, HERM is a Scrabble word!

Letter values in Scrabble US: H 4, E 1, R 1, M 3.

Is it a valid word?

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

a statue consisting of a squared stone pillar with a carved head (usually a bearded Hermes) on top; used in ancient Greece as a boundary marker or signpost