National Geographic Documentary Confirms Hogzilla's Existence
Only lyrics I ever found about Hogzilla were these and I can't say for certain these are the ones that were circulating back when the photos of him were first hit the web:

To the tune of Beverly Hillbillies:

Well, listen to a story 'bout a Piggy who was overfed
til' a farmer in Alalapha done shot that sucker dead
Hogzilla was his name and he weighed in at half a ton
but now his carcass is just a bunch of rottin' bacon
pork that is...
what a waste...

There simply HAS to be more verses than this! I 've also seen the first line quoted as : "this here's the story 'bout a piggy what was overfed" as well as a version where the farmer line has the actual farmer's name, Ken Holyoke or somesuch.