The Japanese word for "Armadillo" is arumajiro アルマジロ, a katakanization.
Another word for "Armadillo" is yoroi-nezumi ヨロイネズミ.
- yoroi-nezumi means "Armadillo" and includes the word nezumi ネズミ, which means "Rat" in Japanese. Note, however, that Armadillos are not rodents.
Beware: some kanji that are difficult to handwrite are easy to type on the computer, which may skew the usage statistics.