1Heat oven to 325°F. Heat taco shells as directed on box. Meanwhile, in large bowl, gently mix fruit.
2Carefully remove cardboard from ice cream (do not damage cardboard). With serrated knife, cut ice cream into 6 (4x1x1-inch) rectangles. (Reassemble box around remaining ice cream for freezer storage; if necessary, wrap carton in plastic wrap to secure.)
3Place 1 rectangle of ice cream in bottom of each taco shell. Divide fruit mixture evenly over ice cream. Drizzle chocolate topping evenly over fruit. Top with whipped cream and nuts. Serve immediately.