I would like to point out to Galaxy_2Alex that according to the Official Minecraft Wiki,
"Mojang Studios has created a number of accounts with specific skins, so that map makers can use common heads without the risk of someone changing their skins. These accounts have names in the format MHF_<_Name_>, for example MHF_PigZombie is the name of a Minecraft user with a zombie pigman head. MHF stands for "Marc's Head Format". There are also a few blocks and "bonus" heads, for more variety."
The very first sentence in the paragraph says that Mojang themselves made these so as to avoid skin changing.
Jack Tiedemann
I would like to point out to Galaxy_2Alex that according to the Official Minecraft Wiki,
"Mojang Studios has created a number of accounts with specific skins, so that map makers can use common heads without the risk of someone changing their skins. These accounts have names in the format
MHF_<_Name_>, for exampleMHF_PigZombieis the name of a Minecraft user with a zombie pigman head. MHF stands for "Marc's Head Format". There are also a few blocks and "bonus" heads, for more variety."The very first sentence in the paragraph says that Mojang themselves made these so as to avoid skin changing.
The link to the page: https://minecraft.gamepedia.com/Head#Mojang_Studios_skins