It seems that It is not NPC, nor player or even a creature existing in Tibia land. This is to be believed an allusion to Frau Mahlzahn. Theory was published by Lucas Abilidebob on Tibia Forum https://www.tibia.com/forum/?action=thread&threadid=4761107 ( screenshot below).
It is worth to add that "Mahlzahn" is German word for Molar- a grinding tooth at the back of a mammal's mouth.... Another bone connection:)
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