I recently came across these LignoLock fasteners -- pneumatically-driven, wooden nails. They come in various lengths, from 1 1/2 to 2 3/8". The manufacturer points out that they are useful because you can plane and sand over them, re-saw them, it's just wood. They claim they hold as well as aluminum nails due to a process they call lignin welding, and when installed do no thermal bridging.

https://www.beck-lignoloc.com/en is their website -- but I am interested to know if anyone in here has heard of them or used them.