The Grynch Clan Goblin are part of the Santa Event (December 20 - December 27).
Grynch Clan Goblin can appear in any city of Tibia (Except in Farmine, Gray Beach and Roshamuul). When they appear, it is announced in two ways (Messages on the screen):
Events:
00:00: Goblins of the infamous Grynch Clan are invading city to steal all presents, beware!
00:02: The Goblins sometimes have stolen presents with them! Confiscate them!
00:03: Return the stolen presents to Ruprecht on Vega at Santa's home for a reward.
Or:
00:00: Goblins of the infamous Grynch Clan are invading city to steal all presents, beware!
00:03: Confiscate the stolen presents and return them to Ruprecht on Vega at Santa's home for a reward.
Grynch Clan Goblin
Health Health: 80
Experience: 4
Speed: 100
Armor: 5
Loot:
0-22 × Gold Coin
Christmas Present Bag
0-5 × Snowball (uncommon)
0-5 × Cookie (uncommon)
0-3 × Red Apple (uncommon)
Lump of Cake Dough (semi-rare)
0-3 × Orange (semi-rare)
0-5 × Walnut (semi-rare)
0-5 × Peanut (rare)
Bottle (rare)
Scarf (rare)
0-3 × Candy Cane (rare)
0-2 × Egg (rare)
Explorer Brooch (rare)
0-3 × Bat Wing (rare)
Snowman Package (rare)
0-4 × Cherry (very rare)
Cream Cake (very rare)
Lute (very rare)
Blank Rune (very rare)
Magic Light Wand (very rare)
Picture (Landscape) (very rare)
0-2 × Gingerbreadman (very rare)
0-5 × Chicken Feather (very rare)
Honeycomb (very rare)
Valentine's Cake (very rare)
Watch (very rare)
Broom (very rare)
Piggy Bank (very rare)
Die (very rare)
Mirror (very rare)
Small White Pillow (very rare)
Flower Bowl (very rare)
Scarab Coin (very rare)
0-2 × Orichalcum Pearl (very rare)
Rope (very rare)
The most valuable are the Christmas Present Bag. Each Christmas Present Bag is exchanged for a Christmas Tokens (With Ruprecht on Vega) and you can trade the Christmas Tokens for the following items:
Christmas Cookie Tray (1 Christmas Token)
Gingerbreadman (1 Christmas Token)
Gingerbread Recipe (10 Christmas Tokens)
Jewel Case (25 Christmas Tokens)
Santa Hat (50 Christmas Tokens)
Santa Backpack (75 Christmas Tokens)
Snow Flake Tapestry (75 Christmas Tokens)
Santa Doll (100 Christmas Tokens)
Snow Globe (150 Christmas Tokens)
Snowman Doll (150 Christmas Tokens)
Santa Frazzlemaw (250 Christmas Tokens)
Leaf Golem Santa (250 Christmas Tokens)
Santa Music Box (250 Christmas Tokens)
Santa Teddy (500 Christmas Tokens)