Grumm was a Llama who used to live in a Savanna.

As Grumm appeared in Llamas with Hats 3, he was entering a "Savanna" portal and had a chat with NPC villagers. Then the Bus driver told him to move house and live in an Extreme Hills biome with snow on it. The Flyin' Llama Bus was still in the savanna and the bus driver visited his bus sometimes to take llamas to another savanna (much like a time machine from Doctor Who).