One possible 'pickles children story' could be that there are some children who enter a competition to make the best pickles. Each child has their own secret recipe and they learn about hard work, cooperation and the joy of creating something delicious. Along the way, they also learn about the history of pickles and how they are made in different cultures.
Generally, no. Fictional name puns alone don't typically receive copyright protection. Copyright is more concerned with the overall expression and content of a creative work rather than just a name pun.
Well, in many jungle novels, a common pun could be related to the names of animals. For example, if there's a sly fox character named 'Foxy' and the author plays with the word 'foxy' to mean both the name and the characteristic of being sly. Another could be around the word 'growl' for a growling tiger, and the author might use it in a double - meaning way like 'His growl was not just a sound but a sign of his inner growl (anger or determination).'
In a pickles children story, one important element is the discovery. Maybe the children discover a new way to eat pickles or they discover that pickles can be used for something other than just food, like making a pickle - powered toy. The characters' personalities play a role too. If there is a shy child who is hesitant to try pickles at first but then becomes a big pickle fan. Also, the plot might involve a mystery around the pickles, such as where did the super - delicious pickles come from.