Mobian Bookworm contains 2 non free firmware packages: https://packages.mobian.org

According to the FSF, GrapheneOS also contains non free firmware:

GrapheneOS is a version of Android which is described as “open source,” but it seems to include software that isn’t free software or even “open source”. For instance, it comes with firmware programs for installation and it appears that at least some of them are binaries without source code. It is said to be “de-Googled,” but includes a way to download and install the nonfree Google Play program.

https://www.gnu.org/distros/common-distros.html