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Well... like you said mounted (Bike, Thunderwolf) otherwise, nope. Nothing increases toughness in the IC armory that doesn't involve a mount.
You can house rule/make up your own rules and try to price them appropriately, but YMMV.
This is a little story about four people named Everybody, Somebody, Anybody, and Nobody.
There was an important job to be done and Everybody was sure that Somebody would do it.
Anybody could have done it, but Nobody did it.
Somebody got angry about that because it was Everybody's job.
Everybody thought that Anybody could do it, but Nobody realized that Everybody wouldn't do it.
It ended up that Everybody blamed Somebody when Nobody did what Anybody could have done.
Back in 2nd edition, characters would often get higher toughness at higher ranks. For instance a marine captain would have T4 while a grand master would have T5. I'm afraid you're out of luck now, unless you count giving Mark of Nurgle to Chaos marines.
2000
orks 2000
dwarfs 800
high elves 3000 
