The University of Virginia reproduces online a poem by Emory Pottle about the death in combat of his friend James R. McConnell of the Lafayette Escadrille in 1917. The poem, entitled "Mac," was apparently written shortly after McConnell was killed. It includes the following lines:

Good old Mac at a party!
A party to us was something
to drink,
A fire, and no work;
Mac reciting:
"Change the name of Arkansaw?
By God, sir--"

It's been conjectured that the author of the bawdy version was Mark Twain.

Twain did write a couple of bawdy pieces, but there seems to be no documentation to credit him with "Change the Name of Arkansas?" - the lines lifted from "Life on the Mississippi" notwithstanding.