Well, since Jelly World doesn't have a link on Neopets.com, there are a ton of links to it on other sites with, of course, the word "Jelly" in the link. Google takes note that a lot of places link to it and use the word "jelly" so it calculates that as a top site for that word.
Google was once manipulated into making the company SCO the top ranked match for a certain inappropriate word (starts with "ba" and ends in "ds") by a LOT of angry people linking to SCO's website using that as the link text. That's since passed, but it gives some insight into how Google works.
I may not have the word "socks" on my web page anywhere, but if thousands of people link to the page, and the text of the link is
Look at those
pink socks!
Google would start ranking my page higher in searches for "pink socks".
So with all the fan sites and help pages linking to Jelly World, it's no surprise that it ranks high for that search.