I was out at the lake swimming today, and near the grassy shore I saw this thing floating around... It's about the size of a grape, it's clear in the middle with a greenish outline, and it's squishy like a frog egg. I know it's not algae or whatever because when I picked it up it held it's round shape and feels like a frog egg. It's got little bubbles or something in it. I don't know if it's a frog egg or not because I've only seen small ones. This thing has no black spot in the middle like a frog egg, but it does have a bit of dark green stuff in the middle. Anyone have any idea what it might be? I took a picture compared to a quarter.