A tadpole who likes to take walks and eat, along with taking life at his own pace. Otamaro's charm point is his facial mole, which can make it appear as if he's crying

He was born in a river somewhere in Japan.

Sanrio's Hangyodon starring as a detective in the case of the mysterious thief.

Three-part series about Hangyodon and friend's time travel adventures.
 
This entry contains: 
1.Kyouryuu Oukoku wa Oosawagi (恐竜王国は大さわぎ) 
Hangyodon and company end up getting sent back to the past through Itaro's latest Time Closet invention and have themselves a prehistoric adventure!
 
2.Mirai Sekai wa Oosawagi (未来世界は大さわぎ) 
Hangyodon and his friends travel into the futuristic 25th century in order to stop Xian Long Bao and save Princess Kingyochan as well as her father, the emperor Chuuka Taijin. The gang might also run into a familiar face or two....
 
3.Hana no Oedo wa Oosawagi (花のお江戸は大さわぎ) 
Hangyodon, Sayuri, and Otamaro are tasked with going back in time to the Edo period at the insistence of rich old Sea-Otter and his ghostly ancestor to retrieve their golden Kannon statue heirloom. Once in the Edo period, Hangyodon and his friends learn of the Full-Moon Kozou, a thief said to soon steal the statue on the next full moon which is rapidly approaching... 
But just who is the real identity of this notorious thief? What does Kingyo-chan's Edo ancestor have to do with all of this? And will Hangyodon manage to retrieve the heirloom in one piece?

After watching a spy movie, Hangyodon thinks spies are so cool. Suddenly, the popular singer Kingyochan gets kidnapped by White Penguin Heart, a dangerous criminal gang led by the nefarious Dr. Monday! It's time for Hangyodon to get into some action!
 
(Source: Sanrio Wiki)