most panthers do not eat plants but you never know so you always have to ask. I have the yellow and green arboricolas and am not 100% sure on that type but I have seen them in other members enclosures.
Yes that is the correct one. They do come in both colors the green like you have and the yellow and green too. In the midwest we tend to see more of the green.
Yes that is schefflera arboricola and it is safe for chams. Just make sure you wash it to remove any pesticides and waxes with a good dish soap and repot it into something that is safe for your cham and drains well as schefflera don't like to have their roots water logged. A mix of sand and coco coir seems to work pretty well. Use more sand than coco coir if you know it's gonna get really wet.
-Alex