Yes, RAMPIONS is a Scrabble word!

Letter values in Scrabble US: R 1, A 1, M 3, P 3, I 1, O 1, N 1, S 1.

Is it a valid word?

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

bellflower of Europe and Asia and North Africa having bluish flowers and an edible tuberous root used with the leaves in salad

Also: rampion bellflower, campanula rapunculus.