This was a very small (maybe 3” x 3”) thin paperback book(let) that was possibly free, as part of I think a bread purchase (maybe Colonial?) in the late 50’s or 60’s. About a boy, very scared of the water, who learns to swim, I think with his family on a camping trip. Name is something like Noah or Jonah, but it is not the book called Noah Learns to Swim. Also not Noah’s Swim-a-Thon.