According to the blog, the only lines Douglass sang were:

Oh John Low! Johnny went down the hi-lo!
Oh John Low! Johnny went down the hi-lo!
Went down the hi-lo to get some gin,
Johnny went down the hi lo!
Drank so much he tumbled in,
Johnnie went down the hi-lo!


The other words posted are the current PC version, with "Arkansas farmer" substituted for the traditional...er, something else.