"Can these boats be rolled?"
Probably, but I've never tried it. With the sponsons inflated (which is really necessary for actual paddling - they provide much of the hull tension) it would be a real chore.
They're a time tested design and surprisingly fast and responsive for their size. I repeat, for their size. Not that I'd ever want to race one of them, but I've paddled my double, rigged as a single, fully loaded for 350 miles across the Canadian Barrens and figure I averaged about 3 1/2 mph for the trip. I also wouldn't want to take it through any technical rapids, but it's been through a couple of big water class 3+ quite solidly. In the early days of kayak river running, these were the boats. But, back to your question, those were the days when the Eskimo Roll was considered either a myth or a stunt.