Does fdroid form have app in android.
There does exist a Discourse app that lets you easily view multiple Discourse-based forums at once.
However it is React-based which iirc F-Droid can’t compile yet.
In the mean time you should be able to
Add to homescreen in your browser, for the progressive web app (PWA).
You can try the PWA(install from any browser menu)
There are lots of RN apps in F-Droid. This is not in F-Droid because of trackers. https://gitlab.com/fdroid/rfp/-/issues/202