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Like French fries, probiotic frozen yogurt is one food group on which everyone is a self-proclaimed expert. So while we could tell you the tart stuff at Yogen Früz, an international chain that has opened its third Chicago location in the South Loop, is a bit icy, and the chocolate flavor is unevenly churned, and the smoothies are kind of watery, we’d honestly prefer to let the Red Mango and Berry Chill aficionados duke it out among themselves.