"Hybrids" are the results of different species being bred, and "intergrades" are the results of pairing two subspecies. So, it is entirely based upon the taxonomy of the parent animals that determines what the babies are.
Until recently, Great Plains Rat Snakes (GPRs) were labeled as
Elaph gutatta emoryi, and Corns were
Elaph gutatta gutatta. So, their offspring (whether creamsicle, rootbeer, cream soda, or whatever) were actually intergrades, since GPRs and Corns were simply subspecies of the same species
Elaphe gutatta.
However, it has now been determined the the identification of both animals have changed. GPRs are identified as
Pantherophis emoryi, and Corns are listed as
Pantherophis gutatta. Since these animals are now listed as different species, the resulting offspring from pairing them are now seen as hybrids.
The definition of "Hybrid" has everything to do with how they were derived (ie: the breeding of two animals of different species), and not the results of that derivation. So, the fact that reptile hybrids can almost always reproduce (unlike mammalian hybrids) is not enough to suggest that they are not true hybrids.
So, the correct term for creams of all types is "hybrid." But, that is only true so long as taxonomists continue to agree on which animal is part of which species. It's all a bit capricious in the end!
