The version my dad told me had elements of all of the above mixed together, but I didn't see this verse, which came at some point after the "hero" of our story has a fight & gets killed (he can't remember the verse but I think it had to do with the boys fighting back to back...)

"Oh kill me, kill me, kill me quick, spare my life!" he cried,
And the villain shot him through the head and killed him till he died.
A fair young maid came down the path; her form was bent with years.
Her eyes were full of sunshine and her cheeks were full of tears,
And recognizing the dying man, she quickly yelled, "Who is he?"
The dead man raised his corpseless head and cried, "By the great Gods, 'tis Lizzy!"

And we used the version "be kind to your web footed friends, for a duck may be somebody's mother, be kind to your friends in the swamp, where the weather is very very domp"