I was born and raised in San Francisco, I also read this article. I lived on the 700 block of Athens St and in the backyards there was and still is a colony of Pacific Chorus frogs that have been there since the 1960's. They would croak when it rained I remember as a kid. You can still hear them there to this day. I was surprised the article didnt mention the frogs that live there.
My PCF should be breeding here in about 2-3 months.