I'm just over the mountains to your west, Paul. In Lewiston our property is super dry and we get lots of toads hanging out in our strawberry and mint groundcover. I've even had to move them out of the star thistle (cursed stuff) as I mow it down, because I'm a big softy. We've never had frogs that I've seen; it's my understanding that frogs need to live near water, but toads don't. Of course, everyone here calls both toads and frogs "frogs," just like any non-honeybee stinging insect is generally called a "yellow jacket." Not sure if you are following the same colloquial pattern and are okay with toads or are looking for true frogs.
If you are okay with toads, I would load up on groundcover and cats. The cats will probably kill a toad (I have yet to see ours take much interest in them, but they love to terrorize rabbits and rarely snakes) but they certainly do put pressure on the rodent population, which discourages snakes, and it is my understanding that snakes love toads and frogs. Plus, a cat is just a pleasurable companion for when you take your mint to make some tea and sit on the porch at night to enjoy dusk and listen to frogs/toads. Just my two cents from someone a few steps over...
