For crust, in a medium bowl, combine crushed wafers and butter; mix well. Press onto bottom and up side of a 9-inch pie plate to form a firm, even crust. Freeze for 10 minutes or until set.
In a large bowl, combine ice cream and whipped topping. Stir in peanut butter just until mixed. Spoon into crust. Freeze about 4 hours or until firm.
Heat fudge topping in a small saucepan. Sprinkle frozen pie with peanuts, if you like. Cut into wedges. Drizzle warmed topping over each piece. Makes 8 servings.