Yes, cud is a Scrabble word!
...and is worth 6 points in Scrabble, and 8 points in Words with Friends
cud
Noun
1. Food of a ruminant regurgitated to be chewed again
2. A wad of something chewable as tobacco
Noun
1. Food of a ruminant regurgitated to be chewed again
2. A wad of something chewable as tobacco