Steve - Quick, take a breath - by the look of the logo, a mudcat is a catfish, very common freshwater fish in the southern US and elsewhere, they can survive in areas with little or no water for short periods of time, hence you sometimes find them in mud rather than water. They have a mild chunky meat that's very popular - so much so that catfish aquaculture is big business in the south.

Being a Yankee (from northeast US) I won't attempt to explain how a catfish became the logo for a folk and blues group, but I'm guessing it has something to do with the southern roots of a lot of that music.

OK, now that you're breathing, I'd better get back to work...