The food guide doesn't mention them. Regular cranberries are on the good list, however. If you try them, I'd definitely make sure they are unsweetened!
I will look for some at the health food store tomorrow. Ruth, you are right, I don't think I have ever seen them unsweetened. I read a recipe today that called for them, but I don't know if they actually make unsweetened, or if it was somebody's hopeful modification of another recipe. I'm going to buy more Madagascar Red Vanilla tea (going to buy a BUNCH this time) and Lunberg Wehani rice, so I'll see if they know of an unsweetened variety.