Yes, gob is a Scrabble word!
...and is worth 6 points in Scrabble, and 8 points in Words with Friends
gob
Noun
1. A man who serves as a sailor
2. A lump of slimy stuff
3. Informal terms for the mouth
What Scrabble words can I make with the letters in gob?
3 Letter Words
2 Letter Words