Ok, this isn't folk, it's rock, but it has a theme (sort of) that's common to folk music. There are songs about fox hunting, ferreting, boxing, horse racing-- I wonder why I've never run across a song about cock fighting before?

Lyrics copied from http://www.kalaajkal.com/lyrics/lyric/504053

LOUISIANA COCK FIGHT
John Nitzinger

Let's have a big hand for the referee,
Havin' this event you're about to see.
Got two red roosters wearin' razor blades,
A cinch that only one's gonna walk away.
There's a creature from New Orleans never lost a fight,
Bet you couldn't beat him with a gun and a knife.
Judging by your scars you're a bettin' man,
So welcome to a Louisiana cock fight.
Get it on - get it on....

There's a cottonmouth farmer come from Baton Rouge,
Meanest man around; he don't like to lose.
Brought a cock fighter back from Mexico,
Give him half a chance he would slit your throat.
I've got us two seats in the second row.
I see the referee's 'bout to start the show.
Judging by your scars you're a bettin' man,
So welcome to a Louisiana cock fight.
Get it on - get it on....

The creature from New Orleans was the first to strike.
He came a-spittin' fire out to take a life.
That screamin' devil's feet never touched the ground,
While the bird from Mexico tried to cut him down.
But I never got to see who had won the fight.
That cottonmouth farmer he shot out the light,
Took everybody's money and the sheriff's wife,
So welcome to a Louisiana cock fight.
Get it on - get it on....