Thanks, Steve.

The song appears a year earlier than Ramsey in "The Charmer: A Choice Collection of Songs, Scots and English," Second ed. (Edinburgh: J. Yair, 1752).

There the folderols seems to occupy only the entire second half of the final stanza - which leads me to think the untitled piece came from the stage, where a costumed singer could dance around while lilting them.

Scott liked the song so much he put two laundered stanzas into "Woodstock" (1826).