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Depends how you define well-known. The Godot showcase lists some of the popular ones: https://godotengine.org/showcase/. I believe Dome Keeper did $1m+ in sales with a 2-person team and I assume Brotato and Cruelty Squad are probably in 7 figures as well. So far, the hits have definitely been on the smaller side, but I expect things will change with Godot 4 being released. Another big factor is that most of the games released so far have been developed by tiny teams.

https://www.cassettebeasts.com/ launched recently. I liked it.

Sega did Sonic Colors in Godot, Dome Keeper and Cassette Beasts as other people have mentioned.

Apparently it was a remastered version, Sonic Colors: Ultimate - It's interesting this came out on the Switch since I'm pretty sure there is no official Switch support in Godot.

Lumencraft is another well-made game using Godot.

4.5min review: https://www.youtube.com/watch?v=w54iBRN8oQQ

Delta-V: Rings of Saturn comes to mind. Though as it's not a very advanced and powerful engine there aren't any very very popular games I know of.