As far as I know, a philodendron IS a pothos.
I have also read that it is the split leaf variety of philodendron that is "most" toxic.
Sort of like how the DWARF schefflera is non toxic, but the giant variety is. Split leaf philondendron are of the "giant" status as well.
Neither my crixs, NOR my cham eat any of the plants in the enclosure...but my Monkey tailed skink devours her pothos.
Her pee turns dark purple/brown from it.
I have read that the Monkey tailed skink is the only species that pothos is NOT toxic to, and that they can live off of it. Supposedly it is related to the fig trees that they spend their lives in on the Solomon Islands.
Now, perhaps by that statement they mean in the same quantities that the skink will eat the pothos. Dill will eat pothos to the exclusion of everything else if I let her....maybe that quantity would kill another species of herp.
Your guess is as good as mine.

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Kim