Never tried it myself, but would certainly be interested in your results.
Under the old rule of thumb of 10 pounds of forage to get 1 pound of weight on a LMB, it would take a lot of mudbugs to make a difference. They naturally exist all over East Texas in yards, pastures, showing mounds any time there is moisture in the ground. They are omnivorous and will eat just about anything.
My biggest concern about bringing in some is the possibility of getting the burrowing type which can do substantial damage to pond dams...not worth the risk to me.