This wiki page is here for legacy reasons only. Older versions of MCreator used to have this feature or the feature does not need extended documentation anymore. Nevertheless, we kept the page for users of older versions.
Here is a list of Minecraft Forge biome dictionary types that can be used in MCreator to tag custom biomes in or to be used with procedure checks for example to conditionally spawn/generate structures, ores, entities, etc.
Keep in mind mods in general can define custom biome tag types too.