The Hut-Sut Song is credited properly to Leo. V. Killion, Ted McMichael and Jack Owens.
It remains to be seen whether Hot Shot Dawson was first or second.

Horace Heidt and His Musical Knights. Heidt credited Kash Killion, McMichael and Owens. I guess Kash was a nickname.
I remember the recording by Sammy Kaye (1941). He credited Killion et al.
No other composer names are credited by any of the singers. Killion is mis-spelled Killian by some.