Snowy Forest

Spawning data tags simply contain a list of Biomes. If you're referring to this list for a Pokemon, please double-check if it has an Anti Condition or Anti Biome. Anti Conditions and Anti Biomes are a way to essentially state: not in this biome/condition, so you'll need to cross-reference them. For instance, if a Pokemon is set to spawn in is_ocean, but has an anti condition of is_cold, it will not spawn in cold oceans.

Our Pokemon spawns are generally based on default Cobblemon configurations with additions to allow the entire dex to spawn in all Minecraft biomes and supported biome mods. Most biome mods are supported such as Terralith, Oh Biomes You'll Go, Incendium, Better Nether, Gardens of the Dead, and The Bumblezone. Other biome mods may also be compatible, provided they label their biomes with data tags.

Snowy Forest Biomes
minecraft:grove	minecraft:snowy_taiga	terralith:alpha_islands_winter
terralith:alpine_grove	terralith:ice_marsh	terralith:siberian_grove
terralith:snowy_maple_forest	terralith:snowy_shield	terralith:wintry_forest
terralith:wintry_lowlands	wythers:deep_snowy_taiga	wythers:huangshan_highlands
wythers:jade_highlands	wythers:snowy_fen	wythers:snowy_thermal_taiga