Yes, there are. There are many fan - created stories that involve Zoro, Robin and Chopper. Some might focus on their adventures together on the Thousand Sunny, like how they work as a team to overcome challenges during a battle with a new enemy. These fanfics can really show different aspects of their relationships that we might not see as much in the original manga or anime.
Friendship is a very common theme. Since Robin and Chopper have different personalities, their friendship is often explored. For example, Robin's wisdom can guide Chopper, and Chopper's pure heart can bring out Robin's softer side.
You can try fanfiction websites like Archive of Our Own (AO3). It has a large collection of One Piece fanfics, and you're likely to find some great ones featuring Zoro, Robin and Chopper there. Just use the search function and type in their names.
One popular 'Robin x Chopper fanfiction' is 'Adventures of Robin and Chopper'. It has a really cute storyline where Robin helps Chopper explore new islands and they form a special bond. The author does a great job of portraying their characters in a way that is both true to the original anime but also gives them new depth in their relationship.
Hard to say. It could be associated with a minor character whose background wasn't fully explored. Or perhaps it was just a random prop without a specific owner.
I'm not sure if there's a character named Chopper in 'Pulp Fiction'. I might be misinterpreting your question, but I don't recall such a character in the movie.
I'm not sure specifically as there could be many 'Chopper Christmas Stories'. It might be about a character named Chopper during Christmas. Maybe Chopper has some adventures or experiences related to Christmas, like celebrating with friends, going on a Christmas quest, or learning the true meaning of Christmas.