I wrote this little song a few years back when my students were having trouble remembering the sound made by OW and OU. I started calling them "The Pinching Sounds" and then this song followed.
It's sung to the tune of "The Five Little Ducks." Because this song is like a little story, my students began to remember the sounds and recognize the letters inside words when reading.
I hope it helps your little ones, too. :)