I just can’t think of another reason why a toad woud step on another animal’s back. That’s how they have sex after all. The female even carries the male around for a while. I think this could be close enough to do the trick for them. Like toads are not deep thinkers. They’re definitely not up there to enjoy the scenery. And it’s too many of them for it to be an accident. Yeah, I thought this through before commenting 😂