Although the adjective, puerile can be used to describe anything related to childhood, more often than not, it is used in a derisive manner to comment on the immaturity, silliness, or juvenile nature of something or someone. So if you hear someone talk about puerile toys, they may merely be remarking on the toys of childhood, but it is more likely they are discussing whoopee cushions, fake dog poo, and the like.