Thanks as well! That's the Kincaid version; with the lyrics on hand I can hear him singing it, even if my turntable doesn't work. I misjudged the date by a coupla years, however!

And with the hyphens and alternate title, I can see a few additional early recordings -- Uncle Eck Dunford on Victor in 1927, and both a Bluebird and a Conqueror by "Skyland Scotty" Wiseman in 1933 and 1934. There are also a few songs entitled "Whippoorwill", cut in the 20s by Vernon Dalhart and in the 30s by the Canova Family, which may be the same one.

No guarantees of content, but check this page
http://cylinders.library.ucsb.edu/search.php?queryType=@attr+1%3D1016+&query=whip
which has a couple of early 1900s cylinders of "The Whip-Poor-Will" song.