This is the list of official Spigot Mob Names as of 1.21. You MUST use names from this list.
If you are using an older server version, and the mob you are trying to use
doesn't exist, it obviously will not work.

Example Config Format:

mob-type: BAT

Available Mob Types (Hostile):
    BLAZE
    BOGGED
    BREEZE
    CAVE_SPIDER
    CREAKING
    CREEPER
    DROWNED
    ELDER_GUARDIAN
    ENDERMAN
    ENDERMITE
    ENDER_DRAGON
    EVOKER
    GHAST
    GIANT
    GUARDIAN
    HOGLIN
    HUSK
    ILLUSIONER
    MAGMA_CUBE
    PHANTOM
    PIGLIN
    PIGLIN_BRUTE
    PILLAGER
    RAVAGER
    SHULKER
    SILVERFISH
    SKELETON
    SLIME
    SPIDER
    STRAY
    VEX
    VINDICATOR
    WARDEN
    WITCH
    WITHER
    WITHER_SKELETON
    ZOGLIN
    ZOMBIE
    ZOMBIE_VILLAGER
    ZOMBIFIED_PIGLIN

Available Mob Types (Passive):
    ALLAY
    ARMADILLO
    AXOLOTL
    BAT
    BEE
    CAMEL
    CAT
    CHICKEN
    COD
    COW
    DOLPHIN
    DONKEY
    FOX
    FROG
    GLOW_SQUID
    GOAT
    HORSE
    IRON_GOLEM
    LLAMA
    MOOSHROOM
    MULE
    OCELOT
    PANDA
    PARROT
    PIG
    POLAR_BEAR
    PUFFERFISH
    RABBIT
    SALMON
    SHEEP
    SKELETON_HORSE
    SNIFFER
    SNOW_GOLEM
    SQUID
    STRIDER
    TADPOLE
    TRADER_LLAMA
    TROPICAL_FISH
    TURTLE
    VILLAGER
    WANDERING_TRADER
    WOLF
    ZOMBIE_HORSE

New Entities (1.21.4+, experimental):
    HAPPY_GHAST
    COPPER_GOLEM
    MANNEQUIN
    CAMEL_HUSK
    NAUTILUS
    PARCHED
    ZOMBIE_NAUTILUS

Legacy Name Mappings:
    MUSHROOM_COW       = MOOSHROOM
    ZOMBIE_PIGMAN      = ZOMBIFIED_PIGLIN

Note: Not all entities can be spawned from spawners in vanilla Minecraft.
Some entities like ENDER_DRAGON and WITHER are boss mobs with special spawn mechanics.
