I do not like this nickname, but I like the idea of giving them a collective nickname - being that they are both thin, wiry and jump high. I submit the "Pogo sticks". One can be Po, the other Go.
So does my dick, but that would make a bad nickname too. I actually like Shaq more than Barkley, but I can't stand Kenny. If you want to do an impression of him, just blurt out something emphatically, and then repeat yourself 4 or 5 times in quick succession.