When Nothing But Unnecessarily Large Tanuki Testicles Will Do – Only In Japan
Those creatures are the "tanukis", they're a type of "Yōkai", a class of creatures from Japanese folklore. Those images are from the Edo period. : r/Weird
The secret threat of tanuki balls – Destructoid
Testicular Tanuki Tales: Japanese Folk Humor for Children with a Ribald Satirical Twist | Cotsen Children's Library
Tanuki: The Canine Yokai with Gigantic Balls
The secret threat of tanuki balls – Destructoid
When Nothing But Unnecessarily Large Tanuki Testicles Will Do – Only In Japan