Stir 1 cup of the yogurt into the whipped topping until well blended.
Remove 1 cup of the whipped topping mixture; cover and refrigerate for later use. Spoon remaining whipped topping mixture into 9-inch pie plate. With back of spoon, spread evenly onto bottom and up side of pie plate. Freeze at least 1 hour or until firm.
Add raspberries, a few tablespoonfuls at a time, to marshmallow creme in medium bowl, beating with electric mixer on low speed or with wire whisk until well blended. Stir in remaining 1 cup yogurt. Gently stir in reserved 1 cup whipped topping mixture until well blended.
Spoon into whipped topping shell. Freeze 3 hours or until firm. Store leftover dessert in freezer.
