I’m familiar with the Aerosmith song, but I have no idea what in the world it has to do with Barnie Fife or Andy Griffith.
Besides the explanation offered by acsenray, I’ve also been told that one reason for the “ink pen” phrasing is that “pen” and “pin” sound essentially the same in some dialects, and that the two words clarify that a request is for a writing instrument as opposed to a hair accessory or fastening device.
Yes, tuna fruit.