Trying these tonight with some jerk chicken drumsticks I have in the oven.
So I made them, and they were pretty easy to make. Mix some grated sweet potato with an egg and a couple of spoons of flour or flour substitute, spice it up to make it savoury, and waffle it up. They turned out kind of floppy and not nice and crispy like a normal waffle (or what they look like in the recipe I found). They tasted okay.
Recipe adapted from https://yurielkaim.com/sweet-potato-waffles/ (I added red onions, garlic, cinnamon and chili powder).