Is it true that iron penis qigong enlarges the prostate gland?

Not studied: After researching this on the internet, I am assuming you are referring to a type of kung fu training that focuses on "strengthening" the penis. I do not believe that this has been reliably studied nor reported in the medical literature.

I doubt it: This is a martial arts move with a glamour name. I don't think any serious scientist is going to waste their time investigating. The claim doesn't make biological sense.