Yes, HALOGETONS is a Scrabble word!

Letter values in Scrabble US: H 4, A 1, L 1, O 1, G 2, E 1, T 1, O 1, N 1, S 1.

Is it a valid word?

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

a coarse annual herb introduced into North America from Siberia; dangerous to sheep and cattle on western rangelands because of its high oxalate content

Also: halogeton glomeratus.