I took photos of it and soon moved it to a bush outdoors. I'm not sure of any great spiritual lesson here, other than the lesson that Proverbs gives about things that are small but wise. Proverbs doesn't mention the frog there, but it mentions the lizard. "The lizard you may grasp with the hands, Yet it is in kings' palaces." (Proverbs 30:28) I'm still not sure how the frog found its way into the house and onto the shower curtain rod.
I'm glad the Lord has such delightful surprises for us, but I wouldn't like to experience a plague of frogs such as the Lord sent on the Egyptians (See Exodus 8.)