Friendly Visitor

When my hubby, my son and I moved into our place last July, not after a week. We noticed a visitor would pop in at around 8pm every night. This treefrog would be suctioned on our front window peeking inside.
My hubby would go outside at the request of my son and go get the little frog, bring him inside and my son would have so much fun with him. He even gave him the name Alvin lol.
The first night my hubby brought him in to visit, we took some pictures of Alvin, and when we let him back outside my son got so upset with us because he wanted to keep Alvin. We had to fib a little bit to get my son in a better mood by trying to cheer him up. We told my son that Alvin just got off from froggy school and his parents were suppose to pick him up by our window, and tomorrow night he would be back again same time to wait for his parents again.
The next night the frog was back again (or maybe it was a different frog) and we brought that one in again. My son wasn't so upset with us after we let the second treefrog go this time because now he felt secure with the idea that the frog would be back the next day.
It did come back the next night over and over again.
I guess we'll see this summer if Alvin the frog will return.