I like to keep the frogs around because they eat all kinds of pests. I give them places to hibernate all winter. You just have to watch out when you turn the soil in the springs because out jumps a sleepeyed frog.
I have found a few control products. If you don't mind chemicals over & out fire ant killer in the blue and silver bag works great on fleas. It has the same ingredient in it that frontline has. There is a chemical called Talstar that kills fire ants. We had to use it in products that was being shipped to locations that did not have fire ants. You can get it at a place in Paris or Rockwall called Estes chemical. You can also melt lye soap in boiling water, about a half bar soap to about 2 gallons boiling water. Any chemical you use, you need to take a rod or something like that about 3ft long and poke down to the bottom of the mound. Then pour the chemical or boiling water into the mound. The ants will get stirred up when you do this, but if you don't get the queen, you don't kill the mound. They may move, but they will still be there.
If you do not like chemicals you can try diatomaceous earth. It will take a while to work and you really need to mix it with something that attracts the ants like molasses or sugar. Never sprinkle it directly on a mound but around it. You can also mix borax with sugar or syrup to kill the ants, again this will take a while.