No, they are different from Big rock etc., but there are approximately one gazillion songs that have a remarkable family resemblance, all romancicising the hobo. Another example is Clique I think that is what Loui Roy means. And I've heard another one (from a real living, breathing, hobo, not a folksinger) called something like "Hobo Bill" (Not "Railroad Bill"). And one sort of wonders if they all are descended from a common ancestor.