Looking at the toe-pads and the eye mask, looks like your average Pseudacris species, but which species occur in your region I do not know, simply because I do not live in California. It looks like it just has a problem producing blue pigment which is making it appear yellow, the green color from frogs comes from blue and yellow pigments, so when it lacks blue coloration or vice versa, the frog comes out an unnatural color, one that likely wouldn't survive in the wild. Beautiful find anyways :happy: