Yes, quag is a Scrabble word!
...and is worth 14 points in Scrabble, and 16 points in Words with Friends
quag
Noun
1. A soft wet area of low-lying land that sinks underfoot
What Scrabble words can I make with the letters in quag?
3 Letter Words
2 Letter Words
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Words that can be created with an extra letter added to quag:
S:quags