M
Favorite Answer
http://www.livingonthevedge.net/2008/08/phillys-first-fro-yo-foray.html
http://www.yelp.com/biz/phileo-yogurt-philadelphia
http://philly.brownstoner.com/2010/06/froyo_craze_alive_and_well_in.php
not sure 'where' in Philly you are---so not sure if those links will help LOL
But they look yummy!
RoVog
I have been to this place on South Street that is one of only a few in the city (that I know of):
Phileo Yogurt