Mix wafer crumbs, nuts, butter and 1/4 cup peanut butter. Reserve 1/4 cup; press remaining onto bottom of 13x9-inch pan.
Beat cream cheese and remaining peanut butter in large bowl with mixer until well blended. Gradually beat in condensed milk. Stir in COOL WHIP; pour over crust.
Drizzle with chocolate syrup; swirl gently with knife.
Sprinkle with reserved crumb mixture. Freeze 2 hours or until firm.
Remove dessert from freezer 15 min. before serving; let stand at room temperature to soften slightly.