Washi Ningyo is Japanese paper doll. Washi itself mean Japanese paper (wa=Japanese; shi=paper) and ningyo means doll/human-shaped (nin/hito=human, person; gyo/katachi=shape).
Washi ningyo is made because the real ningyo is very expensive in Japan, so people in Japan made this washi ningyo. The real Japanese ningyo is made from real Kimono material and the detail is made as same as possible, so the price is quite expensive. Paper is cheaper, so washi ningyo is the choice.
|Japanese ningyo. Source|
|Washi Ningyo 3D Man. Source|
|Washi Ningyo Woman 3D. Source|