What is the 14th poptropica island's name?
It's Steamworks Island #14th Island
You can see all the answered questions about Poptropica by clicking on the blue category link "Poptropica" directly underneath the word "where" in the question above. The most researched and complete answers for Poptropica Islands will be for the questions that end with the island name, e.g. "on Spy island". Questions that end "in Poptropica" may have answers that confuse similar features (keys, doors) on different islands. For solution answers, see the related questions below.
No one could possibly predict what islands will come out or when. Poptropica is changing the way they promote the site almost monthly. While there are definitely several new islands that may or may not be finished, none of them are being specifically announced beyond what is visible on the Poptropica site.