You can find Korok Mask in a Treasure Chest (Forest Coliseum). Korok Mask can be purchased (or repurchased once initally found for the first time) in the following shop locations: ...

It's also a very funny, eight-point dunk on Breath of the Wild, which infamously made you grab 999 Korok Seeds for a bit of golden poo. You may like Like a Dragon series director sums up why ...