I'm not sure about existing less sugar yogurt, but I buy plain greek yogurt and just add what I want to it. I'm not sure what your dietary restrictions are, but you could add fruit, honey, artificial sweeteners, extracts, peanut butter or nutella, jams, or anything to it really. You get more control over the ingredients when you just add your own to it.
I do recommend greek yogurt for this though instead of regular. Regular yogurt already is kind of runny and once you add stuff to it, it gets worse. Greek yogurt is thicker from the start, more solid, so it's less of a messy/runny texture once you add whatever to it.