As heir to the throne, he made an inviting target for school-mates, who ridiculed his protruding ears and called the pudgy prince “fatty.”
As at Cheam, he was taunted for his jug ears, which his great-uncle Earl Mountbatten unavailingly urged his parents to have surgically pinned back.
https://www.vanityfair.com/style/2017/03/the-isolating-boarding-school-days-of-prince-charles?