In art history, there are depictions of naked boys in many works. For example, in ancient Greek sculptures like the kouros figures. These were often used to represent the idealized male form, with a focus on physical beauty, proportion, and strength. They were part of the cultural expression of the time, and were also related to ideas of heroism and divinity.
Sure, comic books are art. They often showcase the talent of illustrators and writers, who use their skills to convey emotions, ideas, and complex narratives in a visually engaging way.