Yes, TROCHLEARS is a Scrabble word!

Letter values in Scrabble US: T 1, R 1, O 1, C 3, H 4, L 1, E 1, A 1, R 1, S 1.

Is it a valid word?

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

either of the two cranial nerves on either side that control the superior oblique muscles of the eyes

Also: trochlear nerve, fourth cranial nerve.

Not playable in Scrabble US: TROCHLEARIS.