There are a couple of ways to find fetish chatroom. The very first way is to use an online search engine like Google or Bing. https://ivfsurvivalguide.com/?p=391 Just type in "fetish chatroom" and you'll get a list of sites that use them.
Another way is to visit websites that are dedicated to kink and fetishes. These sites typically have directory sites of various chatroom that you can join.
Finally, you can try social networks websites like Twitter or FetLife. These websites have hashtags that you can use to find people who are speaking about fetishes.