What is Sherman?

Sherman is a sometimes misguided individual of unknown origin and species. Thankfully, for Amplify fans, Sherman is very curious about science and is always needing help. 
What is Sherman actually wearing on his head? Is it a flower pot, fez, or toothpaste cap? 
Sherman hangs out with a shorter green friend whose name we never find out, but seems to have an IQ much higher than Sherman's. Sherm is not always completely incorrect in his assessments, but pretty much needs help understanding most concepts. 
 |11/13| Jet Ransom: FBI Agent's Log
 Herman's current location is unknown... last reported to be several miles outside the Bermuda Triangle heading east... he has made it off the FBI's radar... for now.
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