Yes, FENNELS is a Scrabble word!

Letter values in Scrabble US: F 4, E 1, N 1, N 1, E 1, L 1, S 1.

Is it a valid word?

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

any of several aromatic herbs having edible seeds and leaves and stems
aromatic bulbous stem base eaten cooked or raw in salads
leaves used for seasoning
fennel seeds are ground and used as a spice or as an ingredient of a spice mixture

Also: florence fennel, common fennel.