Amazon’s Fire TV and Fire TV stick technically runs Android…but you wouldn’t know it from looking. Amazon has a wall of content for its set-top box, and doesn’t want Google (with its own competing platform) to crash the party. But even though the Fire TV only has official access to Amazon’s Appstore, you can install other apps too.
Most Android apps are made for phones, and lack the necessary API calls and design to work with a TV remote interface. There are a few exceptions, most of which are already available for either Android TV or Fire TV. Simple games, like 2048, tend to be playable on the TV as well. Don’t be surprised if you see visual bugs or crashes from apps that don’t officially support the Fire TV platform, though.