Yes, GARGET is a Scrabble word!

Letter values in Scrabble US: G 2, A 1, R 1, G 2, E 1, T 1.

Is it a valid word?

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

tall coarse perennial American herb having small white flowers followed by blackish-red berries on long drooping racemes; young fleshy stems are edible; berries and root are poisonous

Also: pigeon berry, phytolacca americana.

Not playable in Scrabble US: SCOKE.