Do you mean a crossbreeding that produces fertile offspring? One that produces a crossbreed that is sterile? I would doubt Oustaleti, verrucosus and pardalis can even though some consider them pretty closely related. I bet they had a common ancestor but have diversified too much by now. Even some pardalis locales don't seem to be successful, eggs don't hatch, or the offspring end up sterile.
There is so little known about these species' genetic makeup and so few people working sytematically with chams other than pardalis, and many of them are unknown crosses to begin with.
Unless you were trying to inject some genetic diversity back into a genetically suppressed line I can't see why someone would bother.