Small frogs eat small insects, such as crickets, grasshoppers, beetles and ants. They require more frequent feeding than their larger cousins, with most requiring feeding on a daily basis or at least several times per week.
The Radley Sanitarium is located in the fictional Darkette County, Pennsylvania. It plays into the series when Mona is in this facility, but we can guess it has something to do with the story Alison tells about the girl who was sent to a mental institution after killing her twin sister.
In 1910, the Waverly Hills Sanatorium opened as a state-of-the-art tuberculosis hospital. At the time, tuberculosis was an extremely deadly disease, and patients would have to be isolated from the general public. One of the most talked-about haunted places in the sanatorium is the Body Chute or Death Tunnel. A railcar would transport dead bodies from the top of the hill to the bottom, so that other patients wouldn't see the bodies being carried out.