In the vanilla_worldgen configuration, the file name for the snowy spruce configuration in worldgen/configured_feature is misspelled as "spruce_snovy.json".

In the snowy_tundra biome file released by @slicedlime (under worldgen/biome), the snowy_village structure is misspelled as snovy_village.

In the files released by @slicedlime, the zombie_snowy file in worldgen/processor_list is misspelled as zombie_snovy