Yes, fink is a Scrabble word!
...and is worth 11 points in Scrabble, and 12 points in Words with Friends
fink
Verb
1. Take the place of work of someone on strike
2. Confess to a punishable or reprehensible deed, usually under pressure
Noun
1. Someone acting as an informer or decoy for the police
What Scrabble words can I make with the letters in fink?
3 Letter Words
2 Letter Words