Snom is a small, larval Pokémon. Most of its round white body is covered by a translucent shell of icy spikes. Its exposed head features two black eyes and round mouthparts. Four short legs are located underneath its body.
Snom anchors itself to branches with frigid thread it extrudes from its mouth to disguise itself as an icicle while sleeping. Snom consumes snow that has piled up on the ground. The more snow it consumes, the larger and more impressive the spikes on its back grow. As shown in Pokémon Camp, Snom are known to be voracious eaters, only being satisfied with heaping amounts of food.
Snom may be based on a jewel caterpillar. It may also draw some inspiration from the larvae of the Gynaephora genus of alpine or Arctic moths. One particular species, the arctic woolly bear moth, can enter a dormant state that allows it to endure temperatures as low as −94 °F (−70 °C). Snom's voracious appetite in Pokémon Camp is likely a reference to Saturniidae biology, in which the caterpillars eat a large stockpile of food due to losing the ability to eat upon becoming moths.
Snom may be a combination of snow, worm, and nom (slang for eating).
Yukihami may be a combination of 雪 yuki (snow) and 食み hami (eating).