In theory FroZenYo is a great yogurt option. You pay by weight (which tends to be much cheaper than other tart yogurt options) and they have a wall of flavors to choose from that range from chocolate and vanilla to tart and dulce de leche.
Personally, I don't like their tart yogurt in comparison to other local options (it is just a few blocks from tangy sweet), but if you aren't a huge tart flavor fan and would like the regular frozen yogurt choices, this is the place for you.
Pros: pay by weight, lots of flavors
Cons: too sweet, always a line
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