If it is sold in a grow pack, you can probably sprout it with ease.
I typically try all the sweet potatoes first before growing them because it takes space and time to grow them. I cut half of the bud, cook it up for taste, while the other half sits in a water dish for a few days before sprouting.
For the Okinawan, I had to try 5-6 different places to find one that sprouts. At the time, I don't think LSU or a lot of places sell untreated ones or slips.
Okinawan from Okinawa are actually steamed treated to kill off weevils. It is still raw inside but the chance of sprouts reduced after the steam bath.
Oh, UBE from Philippines is another good one to look for. I think it is in the yam family, has a richer, starchier or creamer texture. I haven't seen it sold raw live in the US, even in Philippines grocery stores. You can find them in the frozen veggie section or many pastry or ice cream shops would have UBE products.
I think all the potatoes and sweet potatoes came from South America originally and spread by world travelers to Europe and Asia.