Puddle of oil under a car that has been sitting for a couple of months in freezing weather?

It is possible that the oil pan or oil drain plug may have been damaged during the engine fire or during the freezing conditions. The extreme temperature changes could have caused any existing damage to the oil pan or drain plug to worsen. It is also possible that the oil cooler or oil filter housing may have been damaged during the engine fire as well.

Here is a guide to help you find the leak and repair it if needed:

https://www.2carpros.com/articles/engine-is-leaking-oil

Let us know what happens and please upload pictures or videos of the problem so we can see what's going on.