Yes, fens is a Scrabble word!
...and is worth 7 points in Scrabble, and 8 points in Words with Friends
fens
Noun
1. 100 fen equal 1 yuan in China
2. Low-lying wet land with grassy vegetation; usually is a transition zone between land and water
What Scrabble words can I make with the letters in fens?
3 Letter Words
2 Letter Words