Football chants may be folk songs of a sort. But it's interesting, 'glueman' that you decide that your chosen example is a folk song primarily because its author(s) is/are anonymous. The fact that many traditional songs have no known author is merely an accident of history. This has been discussed 'millions' of times in threads like this but some people will insist on clinging to the notion that the authors of folk songs must necessarily be anonymous.

As for your second example, surely Frank Sidebottom is a professional comedian? Are you counting ditties by professional comedians as folk songs now?

If both of the above are folk songs, they don't really measure up to the old stuff, do they?