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Mole Farmer

Do you know where their nest is? If so, try using diatomaceous earth. It's not really a poison, but kills ants that crawl through it by scratching up their hard outside layer. (Do ants have an exoskeleton?) They eventually die of dehydration.

Boric acid may work too! I know that it works on other ants.

You could also try drenching the mound with a botanical insecticide, like pyrethrin. While it most likely won't get the entire mound, it certainly should reduce their numbers.