Here before the Shanty crowd I submit that a good part of the magic of Mumford was the result of someone attempting to extract some kind of emo-punk out of folk music. In this way, it's probably safe to say that the combination of the two genres should yeild some exciting stuff. With that, take a look at Delta Spirit.
After the San Diego-based emo outfit Noise Ratchet called it quits in 2004, the bassist and drummer decided to ditch their punk influenced sound for something more rootsy. Welcome to the Shanty, Delta Spirit.