As it stands, the Frozen Fire Pit still acts as a regular fire pit for cooking food and both it and the Endothermic Fire Pit function as heat sources for the Imoogi egg to hatch with.

I don't see why this would be a thing at all. You can't roast seeds in an endothermic fire so why should the Frozen Fire Pit be any different nor should an egg get heat from such a fire.