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: ...

Korok Frond in Zelda: Tears of the Kingdom is an item that can be consumed or used in cooking meals to boost health, stamina, or add temporary status effects.

It can be applied at Hateno Village's dye shop ... There are 81 Hudson Construction sign puzzles in TOTK. Compared to the number of Korok Seeds and Shrines of Light, that might not seem like ...