The answer to 'fire ant droppings' is that fire ants do not actually produce droppings. Fire ants are social insects that live in colonies underground, and they do not have visible fecal matter or droppings. What you may be seeing are instead small mounds of soil and debris that the fire ants push up as they construct and maintain their nests. These mounds are a common sign of a fire ant infestation, but they are not true droppings.
If you suspect you have a fire ant problem, it's best to contact a professional pest control technician. Fire ants can be difficult to eliminate on your own, and their stings can be painful and dangerous, especially for those with allergies. A professional will be able to properly identify the issue and recommend the most effective treatment options for your specific situation.