Re:
No, hamsters are not natural prey for corn snakes, neither are the fat and lazy lab mice we feed them now for that matter.
I feed my corns a variety of rodents: rats, mice, hamsters, gerbils. They really don't show a preference for one or the other really. I get a stronger feeding response from gerbils and hamsters however, but they don't get "hooked" on them and hard to get back on more easily obtainable rodents (mice & rats).
I've found hamster and gerbil young are just as seemingly nutritious as a fuzzy/hopper mouse and quite a bit smaller. Where my 3 week old dwarf hamster young are the size of a large pinky mouse, they've got hair and are a lot fatter in body bulk than their mouse counterparts. It's like the nutrition of a full course meal all contained in a portion the size of an Oreo, to give an analogy.
On those smaller bodied corns that *should* be up to fuzzies/hoppers by now, but are still on pinks, I've found the other species of rodent young get that growth spurt started where the snakes can then handle the larger mouse sizes like they should.
Could it be a coincidence? Maybe. But I've seen the results of it in my own snake colony.
So just because they're not natural prey doesn't mean they couldn't or shouldn't be fed as such. Just because I'm American doesn't mean I don't enjoy Japanese sashimi any less.