I would think Amdro would do the trick. Works with fire ants.
The more emotionally satisfying way is to pour a quart or so of gasoline on the mound, wait a couple minutes, then throw a match on it (or, if it’s a really big mound, stand back and shoot a bottle rocket at it). Nice satisfying kaboom, ants turn to ashes. Kills the grass, though.
Some people inadvertently blow up their septic systems doing that with underground yellow jacket nests. There are multiple entrances and the underground tunnels can be quite extensive in a large nest. Igniting gasoline after pouring it into such a nest can be more than you bargained for.