I have seen these "plagues" of frogs, in my lifetime. They usually have been green treefrogs. Had to take a broom and sweep them off the porch and out the door. If you live near water you will probably have toads and frogs in and around your home. They are apparently attracted by light....as are insects (their food).
Now, when it rains cats and dogs or pitchforks and ****** babies, you should take note.