This blog is written by author Sachiko who is not a native speaker of English, so it may be hard to read. It is translated from the summary of Japanese page;

Frogs of stone statue telling spring has come

It has resumed dedicating water to a couple of frogs on both side of the gate of my work place because recent warm temperature does not freeze it.

In Japanese frog is called “Kaeru”, and getting back home is called “Kaeru” too, that is, it is praying safe return of service vehicles.