It's the songs that are allegorical, not the titles. I've run into a Scots song in in MSS of c 1705-25 which is an allegory about the pretender to the English throne at the time (Bonny Price Charlie's father or grandfather?). Whoever he was, in the songs he is a the "Gaberlunzie man" (beggar man). There is another about the same time where he is 'The Highland Laddie".