These animals are a hybrid between two species, they are not their own species. The only naming system that is regulated is that of scientific names (governed by the International Code of Zoological Nomenclature). Since this is a hybrid produced in captivity between two species that would never encounter each other in the wild, you would not be able to describe these animals as their own species under ICZN rules.
Technically common names are not official in any way. If I wanted to call Chamaeleo calyptratus something like the "Purple-assed Camel Lizard", I'd be no more wrong then anyone calling them Veiled or Yemen Chameleons (I'd just confuse a lot of people). So basically, you can create whatever name you want for these animals but no one is under any obligation to accept it, use it, pay any attention to it, or recognize it, nor are they under any obligation not to come up with their own name for them which may or may not be used instead of your own.
In my opinion, its better to refer to them as exactly what they are: Chamaeleo gracilis x calyptratus hybrids.
Chris