Zo-Matoran is Superkid11's nickname for the green creatures that are in the army of Hapori Dume in the Third Movie. Their true name is unknown, but their name does start with a "Zo".
Their heads resemble the head of the Barraki Mantax without the mandibles. Their bodies are like tall Matoran bodies. Their leader appears to be the titan-like being with a large bladed staff on the poster.