The chameleon academy says this about poisonous plants:
Special Mention of "Poisonous" Plants
We in the chameleon world are in a difficult position that we have no idea which plants are poisonous to chameleons. The poison lists we have are for mammals and birds which are just not transferable to chameleons. Although many species are reported to take a nibble here and there, it is the veiled chameleon that is our plant muncher. So we will use the Veiled Chameleon as our point chameleon in our exploration as to what plants are and are not poisonous to chameleons. Veiled Chameleons have been known to ignore the poison lists no matter how much we tell them they will die. Pothos, Ficus benjamina, and Schefflera are all considered toxic, but are regularly reduced to stems by Veiled Chameleons. But they also continue to eat plants that are considered more dangerous such as philodendron and croton. So what can we determine from this? Only that our present lists are not terribly useful. On the bright side, you can follow the present “safe plant” lists for chameleons and you will be fine. But we must not overstate the significance of those lists. We must realize that our confidence in telling people what plants are dangerous might be exaggerated. Please enjoy a mini-gallery of the remnants of poisonous plants that did not affect a Veiled Chameleon.