Help & troubleshooting for channels on your Roku device, including adding/removing channels, logging in to, authenticating, or activating a channel, channel-specific playback issues, assistance contacting channel publishers to report issues, and adjusting channel-specific settings.
My initial response was No, you can only add the Roku app to a mobile device like a phone or tablet. But the more I think about it, perhaps you CAN sideload the Android version of the Roku App onto a Fire Stick. I'm not sure what good it would do you as all it will do is connect to and control any Roku you have on your net. Whether it will even operate on a Fire Stick once installed is anybody's guess.
Roku Streaming Stick +, 3810X, Ser YH0059427035, wifi - Samsung UN55ES6100
Roku Streaming Stick, 3600X, Ser 5S56D8240827, wifi - JVC EM37T