Little Nightmares - DLC Tengu Mask - Xbox One [bandainamcoent.eu]
Little Nightmares - DLC Fox Mask - Xbox One [bandainamcoent.eu]
Xbox One is region-free, so these will work for a US Xbox One.
It's also available for Steam, GoG, & PS4. However, I don't know if those will work in the US. I think those are region-locked to Europe, Australia, New Zealand and Middle East only.