Lobstrok is a texture model for a creature similar to a makrura within the World of Warcraft file directory.
It is unknown whether or not this was the original name for the makrura or if this is simply a tribal leader of the lobster-like race of humanoids. It is probable that this creature type has undergone a renaming, much like the relation between the owlbear and the wildkin.
However, if you are looking for background and information, go to the makrura article.
In Burning Crusade
This section concerns content exclusive to The Burning Crusade.
In Wrath of the Lich King
This section concerns content exclusive to Wrath of the Lich King.