In which comics does the Silver Surfer appear as the Silver Savage?

My son recently saw some images of the Silver Surfer as the Silver Savage and thinks he is the coolest super hero ever. I wanted to see if I could get him one of the comics where the Silver Savage appears.

I am pretty sure he is the Silver Savage when he is forced to fight the Hulk but I can't seem to find the definitive list of comics.

My son is only 3.5 years old but he likes to look at the pictures, so bonus points for indicating any which might be reasonably suitable for a preschooler.