This place has one vegan frozen soy yogurt and then you can modify it with a variety of toppings. I got a junior size cup (~$3) and added dark chocolate shavings and strawberries for another $1.50.
For the record, the junior size cup is perfect size. I can't imagine how people could possibly consume more frozen yogurt in a single sitting.
I thought it was pretty good, but not perfect. The yogurt might have been slightly too sweet, but the toppings were great and the cup came together on a whole.
Given the rarity of vegan soft-serve, I like that frozen yogurt offers an alternative. If Fraiche had some more vegan flavors (how about chocolate?) I'd give it another star.