Couple years ago or so, was with a friend few doors away from my home in her jungle like garden lol.
We seen this can moving ever so slightly by its self in the high grass.. wasn't windy or anything.
Anyways picked up the can, and this frog popped his/her head out for a pose.
Just to let you know, no harm came to the frog.. we were careful to lay back down can where we found it :)