[ Naturally spawning entities only on snow/cold biome ]

The Grinch

The Grinch aka the Christmas stealer, it can attacks you with 40 health and 7 damage and it spawn rarely on the ice plains and ice mountain if killed have a chance to drop Santa hat and coat

Yeti

The yeti or aka the snow beast is a gorilla like beast, it can only spawn on snow biome it have 100 health and 21 damage it isn't shy to attack any player it comes contact with

Coal golem

The unused coal that used to be given to naughty children, now combined and gain sentient now it roam the overworld, with it 150 health and 21 damage it attack hostile monster if killed will have a chance to drop coal block

[ Elf ]

Elf soldier

A basic elf that turn into soldiers, they now attack any players on sight they have the same stat as the player

Elf juggernaut

A much more stronger and armored elf, they used a candy corn mini gun to attack at range and they have 75 health if killed will have a chance to drop elf walkie talkie

Elf minion

A smaller version of elf soldier that help the player, they have 20 health and 6 damage they help the player by attacking hostile monster and can only be spawned by elf walkie talkie

[ Bosses & Pets ]

Santa mecha

A mech that resemblance Santa made by the elf but unlike santa it is more violent and deadly, it have 200 health and 31 Damage, it also attack by shooting snowbomb and summoning elf soldier, it can only be spawned by using 3d recall cookies. the recipe for the cookies it self:

Santa mecha pet

A miniature version of Santa mecha it is passive and can be tameable with glass of milk, it can only be spawned with its spawnet

Winterween tree

A christmas tree that is now corrupted by the Halloween spirit turning it into a monster, it have 150 health and 18 damage, it also summon winterween saplings minion to attack, it can only be spawned by using cursed sapling, placing it and then destroying it (only work in survival)

Winterween saplings

A miniature version of winterween tree, it have 15 health and 3 damage it attack the player and can only be spawned by winterween tree

Winterween pet

Another miniature version of winterween tree but this version is passive and can be tameable by a player with an apple and it can only be spawned with its spawner

Ice serpent

An ice serpent that roams the cold ocean, it have 100 health and 12 damage, it spawn naturally on cold and frozen ocean if killed drop ice and ice scales

[ Item & equipment ]

Candy cane sword

Damage : 18
Durability : 246
Obtainined from: Santa mecha

Razorleaf (projectile) 

Damage: 10
Delay between shot: 1 second

Glass of milk (food) 

Saturation : good
Nutrition : 4
Additional effect : clear all effects on player when used
Obtained from : crafting

Snowbomb (projectile) 

Damage : 3
Additional effect : explode after a while
Delay between shot : 2 second

Snow staff (projectile) 

Damage : 15
Delay between shot: 2 second
Additional effect : summon another snow projectile after hitting an object 

Obtained from: winterween tree

Sled spawner (projectile) 

Obtained from : winterween tree

Mechanical deer spawner (projectile) 

Obtained from : Santa mecha

Santa mecha pet spawner (projectile) 

Obtained from : Santa mecha

Winterween tree pet spawner (projectile) 

Obtained from : winterween tree

Sacko spawner (projectile) 

Obtained from: Santa mecha

Santa hat (helmet) 

Defense : 4
Durability :  471

Santa coat (chestplate) 

Defense : 9
Durability : 639

Santa pants (leggings) 

Defense : 7
Durability : 606

Santa boots (boots) 

Defense : 4
Durability : 540

Frost javelin (sword and projectile) 

Damage : 13
Durability : 1532
Additional effect :  can be infinitely thrown
Obtained from: crafting

Ice scales (item) 

Obtained from: ice serpent

Frost helmet

Defense : 5
Durability : 519
Obtained from: crafting

Frost chestplate 

Defense : 9
Durability : 703
Obtained from: crafting

Frost boots

Defense : 4
Durability : 593
Obtained from: crafting

Elf walkie talkie (projectile) 

Delay between shot : 2 second
Additional effect : summon elf minion

[Misc entities and blocks]

Sled
A wooden sled, it have decent speed and if killed will drop its spawner

Mechanical deer
A robot version of the deer can be ridden by the player and the elf if killed will drop its spawner

Sacko
A sentient Santa sack, works as a walking chest, will follow the player after being tamed with a glass of milk

Present box (block) 
A present box dropped by Santa mecha, will contain a wood type, ore/resources, and one random tool come with the color red, blue, and free

Explosive box (block) 
Look identical to present box but when destroyed, it spawn a tnt instead