It will be a perfect time to eat sweet potatoes soon in Japan :D
There are many different type of sweet potato dishes, my favorite one is called "sweet potato"......!
It is a sweet that is made out of sweet potatoes. Basically it is mashed sweet potatoes mixed with sugar, milk, butter, cinnamon or vanilla that is formed in oval in most cases with yolk brushed over and baked.
We call sweet potatoes satsuma imo in Japanese and the sweet potato sweets "sweet potato."
It sounds more like "sui - to po te to" (sue e eat oh poe te toe)