I'm with you on Child 44. There's a partial conceptual resemblance, of course, but no more.

I have no position on Buchan's authorship, however.

If you can stand it, check out the more or less improvised versions of "Roll Your Leg Over" on Youtube. And there are many, many more written ones on line.

It is often presented as a RenFaire song, i.e. "Elizabethan."

ISTR that Lloyd frankly acknowledged concocting the folkie version, around 1966. It's a good song.