Seems Muddy is asking Radar, "What the hell is this?" and Radar's saying, "Be cool Kid, you'll love it. It's the beach."
He's just a pup, even Radar doesn't like the surf as much as he does smooth water, maybe the tidal creek at Compass Cay will be more his style. We're sure little Muddy will figure it out in time.
Now it's bath time.