I've never heard of toads clicking before, other than if it's a male that's annoyed or stressed out by being touched, they can generally make sounds of discomfort like any animal and the male've got better equipment for sound than the female.

Sounds very shady with the suitcase story

Whatever the truth may be, "snorting" or "snuffing" _can_ be reapiratorial annoyance, due to too low temperatures.
Also if they are fairly the same age, but ithere's a narked weight- or muscle difference in them (apart from the natural male/female size difference, but like one of them having smaller or weaker forelims and staying skinnier), it is normally the sign of parasites or worms.

I don't know if you've had this done yet, but wild caught animals for sure carry parasites and it can cause them alot of problems later in life, if not handled. I'd suggest a fecal test done