I know of at least one group and I've also seen printed lyrics that sing, "Hot Corn, Cold Corn bring along a Jimmy John (instead of demijohn)." This is of couse a different song.

It certainly seems reasonable that Emmett misheard the chorus, which he probably got from African-American sources and instead wrote:

CHORUS: Jim crack corn I don't care,
Jim crack corn I don't care,
Jim crack corn I don't care,
Old Massa gone away.

Gimme cracked corn certainly makes sense. Bring out the jug 'cause Massa gone.

-Richie