Only a few bait products are currently approved for use in the home vegetable garden:
Certain contact insecticides can be used for individual mound treatments in vegetable gardens. You may also apply baits or other products around but not inside the garden to reduce the overall fire ant population. See Fire Ant Control: The Two-Step Method and Other Approaches
Check the labels for the various products that can be used in home vegetable gardens. Read and follow the directions.
Find more information about fire ants in eXtension's Imported Fire Ant Resource Area.