Yes, and from how I understand it, it is also a native app in android/ios.

But I just checked on my Mobian install on the pinephone and that app looks a lot like the telegram web app. Which, by the way, is one of the best executions of webapps I've seen to date.

Edit:

I should clarify, I mean the telegram app that came preinstalled on mobian. There may be others that I'm not aware of. On ubports there were at least two IIRC

Edit 2:

And going by this GH issue [1] there is in principle no reason to not run the native QT app on the pinephone. Of course, I'm not sure how it would handle the sreen size etc. And it is only for the snaps apparently.

Edit 3: disregard edit 2, I'm stupid. Thanks to @linmob for the correction. :)

[1]: https://github.com/telegramdesktop/tdesktop/issues/5759