A foil pan refers to a cooking utensil made of aluminum foil that is shaped like a pan. It is disposable and typically used for baking or roasting food.
After I got a stove (but still no sink) I made this in the oven in a disposable foil pan. (smittenkitchen.com)
Pour rice mixture into bottom of a large disposable aluminum foil pan, either a deep half - size steam table pan or a deep, large lasagna pan will work. (dinnerandconversation.com)
I think you could also substitute tin foil pans too. (thecraftycrow.net)