Merm Heads are decorative structures usually found around Pig Villages. Destroying one with a Hammer drops 2 Rot and 2 Twigs.
Trivia
Merm Heads can be found around the Pig Villages. While Pig Heads can be found around the Merm camps. This might symbolize the war between Pigs and Merms.
The Merm Head is slightly taller than the Pig Head.