Can I unlock an iCloud ipod that I bought and no code
No, there is absolutely no way to bypass the iCloud lock. Usually the only reason it's on is because the iPod was stolen, that's really the whole point of iCloud lock---even if a thief stole your Apple product, he wouldn't be able to get your data off of it and he wouldn't be able to use it after stealing it. 

DO NOT buy one as it would be about a useful as a brick to you.