yes indeed!
I've not heard them called that exactly before but I knew exactly what you meant by it so maybe it is a good name for them.
For the benefit of others; they are for spreading the LH dropout away from the hub so that an inner tube/tyre can be replaced without removing the rear wheel. This is of some benefit on bikes with hub gears, hub brakes, and chaincases, because it can save about 30 minutes of cursing.
Unsurprisingly, very many frames take a 'set' when you treat them thus (and I would never do this with a lightweight frame...), but 'gas pipe' roadsters must have, erm, nice ductile chainstays, because I don't recall hearing of one which actually broke when treated thus. Maybe if you have lots of punctures...
Now, if mystery tool #4 has everyone stumped, should I reveal it?
cheers