Gray Treefrogs are nearly invisible, but you find them everywhere. They look like lichen-covered tree bark, and during the day hide silent as stones under tools in the yard, upturned buckets, the siding on the house, etc..
If you pick one up, and open your hand to look, it will leap onto the nearest treelike object, which is usually your wife or daughter, or perhaps the gentleman at the door endeavoring to interest you in the salvation of your soul. Indeed, they do. They cling with a wet thwack, like a soggy noodle, to roughly the same place you’d stick a lapel pin, or boutonnière.
At night, after a summer storm, they get out of hand in other ways, in which they make the loud noises, instead of their startled landing sites.