Not many keychains and pins of Alolan Marowak have been released as of right now. I doubt that's really ever gonna change, but you never know.
Cubone Halloween 2017 Rubber Strap
Manufacturer: Pokémon Center (Japan)
Product Line: Pokémon Halloween Time
Release Date: September 2 2017
Purchased From: Mercari Japan
This features Cubone wearing a jacket that looks similar to the markings of Alolan Marowak. Very cute! I wish that this art was used for more Halloween products that year.
Figure Strap
Manufacturer: Takara Tomy A.R.T.S (Japan)
Product Line: Pokémon Netsuke Mascot Sun & Moon 2
Release Date: December 2017
Purchased From: Mercari Japan
Stock photos of this show the cord as red, but mine has a blue one instead. I'm not sure if that means mine is just a different variant or the stock photo is wrong.
Pokémon Center Pin
Manufacturer: The Pokémon Company International (USA)
Product Line: Pokémon Center Pins
Release Date: May 2017
Purchased From: Worlds 2017
I really like these pins in general, they feel very high quality and aren't as shiny as the TCG pins. This one came bundled with an Alolan Raichu pin, which I have since sold.
Better Together Pin
Manufacturer: The Pokémon Company International (USA)
Product Line: Better Together Pokémon Pins
Release Date: March 6 2018
Purchased From: Worlds 2018
This came with a matching Kantonian Marowak pin. I don't display it with the Alolan Marowaks, but I'm still keeping it.