Yes, there are, or probably what is good enough. We got the following for William when he was having noise issues at the pool. You soften the material and then push it into your ear and it forms into the shape of your ear. (Aside, it was super useful. The ear plugs kept out some of the noise, and his ability to behave during his lessons turned around on a dime. Totally worth it.)
http://www.earbandit.com/go2/puttybuddies.cfm

You could also do the headband or a swim cap for added protection.