A small or diminutive armadillo, or a term used to refer to armadillos generally in some contexts, particularly in Spanish-influenced regions.
From Spanish 'armadilla,' a diminutive form of 'armado' (armed one), referring to the animal's armor-like shell. The Spanish diminutive '-illa' makes it 'little armored one.'
The Spanish perfectly captured the weird concept of an armored mammal by calling it 'little armored one'—and despite sounding like a silly word, it's actually descriptively perfect for a creature that looks like nature designed a tank.
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