Froslass is a humanoid Pokémon with a hollow torso that resembles a kimono. It wears a red band around its waist, reminiscent of an Obi. Its body lacks feet and it floats in the air like its counterpart, Glalie. Its arms are connected to the sides of its head, and flare at the wrists. The flared portion has dappled, light blue coloration. Its hands consist of three small fingers. Froslass's head is shaped similar to a sideways water droplet, and is topped with two ice crystals that resemble horns. Its head has several holes on it, resembling a mask. Through two of these holes, crystal blue eyes with yellow sclera can be seen. It also has a mouth below this "mask".

Froslass lives in snowy areas and has the ability to freeze foes with its -58 degrees Fahrenheit breath. It is thought to display its victims secretly after freezing them. As evidenced in the anime, it can create illusions to manipulate others. Froslass is a female only species, and is said in legends to be the spirit of a woman who was lost in the mountains.

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