Why, the gray tree frog does that. Maybe you've heard its birdlike call, a rolling, hollow and very loud trill, BRRRRRRP! coming from up in the trees in the evening woods in midsummer. It's a true tree frog, with big sticky Velcrolike pads on its toes, impressive jumping skilz, and even madder clinging skilz. It's a Spiderman among frogs.
And put him on a licheny branch where he'd blend in and be happier. Well, he felt so comfortable he pinched a big gray tree frog loaf, right there in front of me and everybody. Enh! Enh!
After Chet was wrongly implicated a few times for dropping stray bits on the sidewalk, I've taught my family to recognize toad turds as well as copperhead and rat snake turds. This, my friends, is a gray tree frog turd. Much larger than you'd imagine he could make, about 3/4" long! Why, I stepped over an American toad turd on the sidewalk this morning. Solid black, no dab of white like a rat snake's has. And big. Look for them. Or don't. Whatever floats your boat.