The was the Debian effort, there was one from some Arch Linux users some years ago.
But aside from being interesting novelty projects there is little point, which is why none of the attempts have really taken off.
If you read this you will see some of the rationale, but much of it is now irrelevant:
https://wiki.debian.org/Debian_GNU/kFreeBSD_why
The "Why would you prefer Debian GNU/kFreeBSD to Debian GNU/Linux?" could equally be "Why would you prefer
FreeBSD to Debian GNU/Linux?"
But also: "Due to license and patent issues, ZFS is unlikely to appear on Linux.". No longer the case.
The "Why would you prefer Debian GNU/kFreeBSD to FreeBSD?" section boils down to ideological reasoning and "If you like the Debian package system"...
I see no benefits with the Debian packaging system of FreeBSD's pkg(7) and the ports tree.
There is also no obvious benefit to taking the FreeBSD kernel and tacking it onto the GNU userland as a replacement to Linux, for a person who is already using FreeBSD.