Yes, TURNED is a Scrabble word!

Letter values in Scrabble US: T 1, U 1, R 1, N 1, E 1, D 2.

Is it a valid word?

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

change orientation or direction, also in the abstract sense
undergo a transformation or a change of position or action
undergo a change or development
cause to move around or rotate
change to the contrary
pass to the other side of
pass into a condition gradually, take on a specific property or attribute; become
let (something) fall or spill from a container
move around an axis or a center
cause to move around a center so as to show another side of
to send or let go
to break and turn over earth especially with a plow
shape by rotating on a lathe or cutting device or a wheel
change color
twist suddenly so as to sprain
cause to change or turn into something different; assume new characteristics
accomplish by rotating
get by buying and selling
cause to move along an axis or into a new direction
channel one's attention, interest, thought, or attention toward or away from something
cause (a plastic object) to assume a crooked or angular form
alter the functioning or setting of
direct at someone
have recourse to or make an appeal or request for help or information to
go sour or spoil
become officially one year older

Also: change state, change by reversal, move around, turn over, call on.