I never really thought about using frozen cranberries in my smoothies either! (theharvestkitchen.com)
Instead of the raspberry jam, I take 1.5 cups of frozen cranberries and cook it down in a pot on very slow heat, until the consistency is like jam. (elanaspantry.com)
I don't see why you couldn't make this with frozen cranberries, but I have never actually tried it myself. (cookincanuck.com)