While not officially verified for the Steam Deck, Top Gnome works very well on the Steam Deck, almost like it was made for it. This means you can gnome on the go!

Riding a train? You can gnome.
In a long line? You can gnome.
Waiting for your tax returns? You can Gnome!

Just don't gnome and drive, it's dangerous and reckless for your fellow non-gnoming drivers.