These amphibians are considered an invasive species. They were released into the wild from research labs. They have three claws from each hind foot, which they use to tear apart their food. Photo from Kclarksdnhmorg on Inaturalist.org.
Not sure why they call it a tree frog, since it is mainly a ground-dwelling frog. They feed mainly on small invertebrates. These amphibians make advertising calls to attract members of the opposite sex. A chorus of tree frogs can be heard in the evenings near the Otay river, especially in the canyons. I found this little fellow crossing a street, probably looking for a girlfriend! Personal photo.
These little guys love to hang out in loose, damp soil under oak trees. They are about the size of a worm. Sometimes people confuse them for worms. Photo taken on Otay river from bgraham on Inaturalist.org.
These are burrowing toads. The name comes from a bone they have in their hind leg that allow them to dig. They only enter water to breed! Photo taken near Otay river near lakes (iNaturalist.org).