As far as carnivorous plants: They are safe as long as the chameleons are not babies that fit into the traps. The biggest problem you will have with venus fly traps is their dormancy requirements and need for light. So you would need them up close enough to the lights to get bright light and then you would have to remove them every winter for a couple months in the fridge. So the experience will be labor intensive. Pitcher plants (Nepenthes) do great if you get the right varieties. Nepenthes alta, "ventrata", or "Miranda" are good middle of the road that do not need the extremes of the low land or highland. The North American Sarrecenia or Darlingtonia would have the same types of problems as the Venus Fly trap.