Preheat oven to 350 degrees F (175 degrees C).

Roll cinnamon rolls onto a work surface to desired thickness; press into the bottom of a 9x13-inch baking dish.

Mix oats, brown sugar, flour, 1 tablespoon cinnamon, and salt on a bowl; add margarine and mix until crumbly.

Spread apples over cinnamon roll crust. Mix white sugar and 1 teaspoon cinnamon together in a bowl and sprinkle over apples; top with oat mixture.

Bake in the preheated oven until apples are tender, 40 to 50 minutes.

Place icing in a microwave-safe bowl; heat in microwave until warmed, 20 to 30 seconds. Pour icing over crisp.