Shirakami Fubuki's form as a chibi kaiju in a Holo no Graffiti short. Fubzilla is her official English name according to official YouTube subtitle translations. Her Japanese name is Fubura, similar to Godzilla's Japanese name Gojira.
She's often used as a sort of alternative mascot for Fubuki, thanks to her plush-like proportions. In fact, she is just as often depicted as plush-sized than kaijuu-sized.