Danbo is a fictional character. It's a cardboard box roboter and appeared in the Yotsuba&! manga by Kiyohiko Azuma. There are several other names for Danbo like Danboard and Danboru but
Danbo is the name used in the manga.
The Danbo I use for photography is the, about 8 cm tall, amazon.co.jp mini Danbo version.