Generally frogs follow insects. If there are a lot of bugs there will be a lot of frogs. Get rid of the bugs and the frogs will (mostly) go away.
Possibly the biggest frog debacle I've seen was when my Dad had cancer, we set up an indoor tomato-growing operation in my greenhouse where he could have fun and stay warm. Tomatoes draw white-flies. White-flies draw frogs. There were actually as many frogs as tomatoes on those vines. When you emerged from the greenhouse, there would be frogs on your shoulders, one on top of your hat, maybe one inside your shirt. Sometimes I'd be back in the office before I noticed one on me. Or it would suddenly jump from my hat onto the computer. It took a couple of years for things to get back to normal.