Tumblebot

are NaN Enemies in.

Characteristics
NaN Tumblebots are gelatinous NaN Enemies found in large groups in the ZA:. They typically roll around at random, not attempting to attack ZA:. They are very weak and can be defeated with one strike of the ZA:.

Nomenclature
ZA: appears to be a portmanteau of "tumbleweed" and "Series:".