In the Marvel Comic Strange Tales #107 (April 1963) by Stan Lee, Larry Lieber and Dick Ayers, Namor the Sub-Mariner is depicted as being able to puff out his body "as a puffer does."
The justification given is that he "possesses the powers of all the creatures living beneath the sea." From reading most all of Namor's appearances over the last few years, not only does he never use this incredible puffing power, he doesn't seem to have any real power besides super strength and resilience. Does Namor still possess the powers of all sea creatures, or was this just a one-off, goofy Silver Age moment?