Ah, Wikipedia:
The song tells the story of a one-armed Cajun alligator hunter named Amos Moses, who was "named after a man of the cloth," son of Doc and Hanna Milsap, who lives "about 45 minutes southeast of Thibodaux, Louisiana" (which, at the rate of a mile per minute, would be near Galliano, Louisiana),
― Ned Raggett, Thursday, 21 June 2018 03:41 (five years ago) link