On ninja smoothie maker reviews Wikipedia the language links are at the top of the page across from the article title. Drawing of the archetypical ninja from a series of sketches by Hokusai.

In the unrest of the Sengoku period, mercenaries and spies for hire became active in Iga Province and the adjacent area around the village of Kōga. It is from these areas that much of the knowledge regarding the ninja is drawn. Ninja figured prominently in legend and folklore, where they were associated with legendary abilities such as invisibility, walking on water and control over natural elements. The word shinobi appears in the written record as far back as the late 8th century in poems in the Man’yōshū. Historically, the word ninja was not in common use, and a variety of regional colloquialisms evolved to describe what would later be dubbed ninja.