Make the sandwiches when the ice cream is still soft, just after coming out of the ice-cream freezer. You can eat them right after they're made, or wrap the sandwiches in plastic, freeze them, and enjoy them for an easy dessert or quick snack later.
Spread 1 tablespoon marshmallow creme on the flat side of each of 16 cracker halves; spread 2 tablespoons Chocolate Fudge Ice Cream over each cracker half. Top with remaining cracker halves, flat sides down, pressing gently. Wrap each sandwich tightly in plastic wrap; freeze 4 hours or until firm.