My friend Evelyn Greene came through with an ID for this stuff, thanks to her friend Bob Duncan, who says this is a green alga called Trentepohlia aurea. What?! A GREEN alga?! Yup. It contains a chemical that masks its chlorophyll. Google that name, and lots of photos that look like this will pop up.
What a face, indeed! Because that face is so broad that it pushes the frog's ears skyward, one reader has suggested that this is instead a Bullfrog, not a Green Frog. Unfortunately, I couldn't get closer photos or profile shots to clinch the ID. One thing is certain: this was a BIG frog with a BIG WIDE mouth. And it's still the first frog I have ever seen sitting on a lily pad.
Update: I heard from NY State Chief Botanist Steve Young that Utricularia inflata has not only been removed from New York's endangered plant list, it is now considered a dangerously invasive plant in certain areas where it is crowding out other native species. That's the bad news. The good news is that the bladderwort in the photo above is more likely Utricularia radiata, or Small Inflated Bladderwort, since those radiating arms are only a little longer than an inch and branch out only at the ends. Another distinguishing feature is that the flower petal's lower lip has three distinct lobes. U. radiata is indeed a rare plant in New York, and as far as I can tell, has never been reported in Saratoga County. Until now.