So the Lizadmen roster just dropped and the only issue with it is that there are "feral" Cold Ones, Carnosaurs, Stegadons and Bastilladons in the roster. The Lizardmen aren't "one" with the jungle; the creatures that they use as mounts are raised from birth and will usually go through several generations of Skins raising and training them before they are ready to be used in battle.
If "feral" creatures were in their army then they would turn on the Lizardmen just as quickly as their opponents. The only approximation to feral creatures that fight in the Lizardmen army are Jungle Swarms and Salamanders/Razordons and the latter have a nasty habit of eating their handlers and going berserk but those haven't even been included, presumably saving them for Tehenhauin's (spelled it right first try, that's a first) Rat and the Serpent DLC.
Also worth noting that should a Carnosaur, Stegadon or Bastilladon lose its rider/crew in battle there is a decent chance that you will lose control of it on the Tabletop and it can be just as likely to attack your own army as the enemy; to think they could send them in without a rider/crew in the first place is ridiculous.
I really hope CA remove these units from the game before it is released but if not then we're going to need a new Lorehammer mod to do it for us.