He called him Kon, in Batgirl, when Batman told Superman to tell Superboy to stay away from Batgirl. It was a funny scene, with Bats being a bully and you know Superman is just mentally rolling his eyes.

As for Kon/Tim, I've written a lot of them and so has:

ilyena_sylph
pervyficgirl
amarin_rose
merfilly
ladyoneill
cero_ate