Looks like #Tootle works OK on the #Librem5 as a Mastodon client.
You can see toots and (if you are seeing this) you can toot too. :)
It seems to be missing a way to follow a hashtag easily. I see how you can search for them, but I’m hoping there’s a less-involved way to do that. Right now, I’m using Firefox for that. Can anyone point me to something I’m missing?