It is helpful for solving puzzles involving Leif's Freeze field skill.
How to Acquire
There is 1 Extra Freeze medal available. It can be found after defeating Chapter 4's boss and going to back to Snakemouth Den to access Upper Snakemouth, which only requires the Peculiar Gem, making it technically possible to obtain before officially completing Chapter 4.
Found inside a broken capsule, in the northeastern room.