Hidden frog

You may be wondering, where did the frogs come from? I have no idea, but there is about an acre of empty forested land (full of refuse) next to my lot, so I guess they come from somewhere in there. Frogger, the first frog, showed up one day last summer. Soon after, another frog showed up. They both stayed around all summer, and then frog #2 disappeared in the fall, without even a note. Frogger stuck around all fall and through the winter, frozen at the bottom of the pond. When spring came, Frogger thawed and was good as new. I was a bit disappointed that frog #2 didn't stick around, since I was hoping for tadpoles, but since I had to re-do the cement in the spring the pond probably wouldn't have been a suitable place for reproduction and metamorphosis. Some time in early August of this year, two new frogs showed up. The photo is of one of the new frogs hiding in the reeds. They are smaller than Frogger, which makes me think they are this years crop. Frogger is very partial to the lower pool, but the new frogs travel from pool to pool and seem to prefer the upper pool. It took a while to confirm that I actually now have (at least) three frogs, because I can't tell the two new ones apart, but I finally saw all three at once about a week ago. I hope they will all stick around through next winter, and then in the spring, dare I dream, tadpoles?