Western toad (Bufo boreas)
A few amphibians make Poison Water Spring their home, at least during the dry months.
Water is scarce and localized on the ranch, especially during the hot months, so it seems likely that most frogs and toads are underground estivating in August when these pictures were taken.
The spring seems to be an oasis for only a few amphibians.
California red-legged frog (Rana draytonii)
The photos were all incidental, taken while bats, jackrabbits or birds triggered the camera.
Froglets, toadlets, or maybe Pacific tree frogs (Hyla regilla)
Pacific tree frogs were the only amphibians we encountered when setting the camera.