How to get the id of a head
Solution 1:
1.12-
Command
/give @p minecraft:skull 1 3 {SkullOwner:"_plague_doctor__"}
Put On Head
/replaceitem entity @p slot.armor.head minecraft:skull 1 3 {SkullOwner:"_plague_doctor__"}
/give @p minecraft:skull 1 3 {SkullOwner:"_plague_doctor__"}
/replaceitem entity @p slot.armor.head minecraft:skull 1 3 {SkullOwner:"_plague_doctor__"}