Microwave the fudge and caramel topping for about 15-20 seconds to loosen it and make it spreadable, if necessary.
Line the bottom of a 9×13 baking dish with a layer of the ice cream bars (10 of them; trim if necessary.)
Spread half of the hot fudge, followed by the caramel, and then Cool Whip over the sandwiches. Sprinkle on half of the chocolate chips and toffee pieces. Repeat layers.
Freeze until firm, about 1 hour. Cut into squares and serve.