I do a lot of
cold bluing and it's not technically the same as black oxide. Black Oxide is Fe3O4. Cold Blue is SeO2 (selenium dioxide). Cold blue is inferior to hot bluing in almost every way except convenience.

For anyone else even remotely interested, I've done quite a lot of cold bluing and it doesn't turn steel blue. But I have tricks to getting it this black. You can see I'm using Brownell's Oxpho blue, but there are others. If you want tips, just PM me.

(Not mine) This is Snap on's black chrome. These aren't the only things they make using black chrome. Its a plating.

This
might be black chrome or maybe I'm wrong. It's not like any other black oxide tool I own. I suspect this is what the OP was talking about.

These
were black oxide, and I touched them up with
cold blue, just as one would a firearm. Keeping them looking like this isn't super easy. They need regular oiling.
In my machine shop, that's not a problem.

I have several drawers of black oxide Snap on tools.

I've posted this pic before and gotten comments about how
rough these wrenches look. I oiled them then took the picture and I feel as tho 11/16", 13/16" look WAY worse in this pic than they do in real life. These have been re-blued and I always leave whatever finish exists. I can, and for some stuff do, strip and polish then blue. And that does produce a nicer looking finish. But it's not as durable as black oxide.
Summary:
Snap on absolutely does offer black chrome finished tools, which is distinct from black oxide.