Gren Acorn was a Ghumbi from Fungwood and the Mayor of Rootrot. He had what seemed to be almost an obsession with the culture and technology from Eroe, and was regarded as strange by the other members of the Fungwood Council. He was quite progressive in his thinking on how Rootrot should be run, and Acorn is well-liked by the town, even though some Ghumbi on the Council felt like he should retire. He founded Fungwood's first factory.