Dokonjou Gaeru

This classic 70's manga by Yasumi Yoshizawa is about a young middle-schooler named Hiroshi, who accidentally slips while running around one day and squishes a wide-eyed frog onto his shirt. To his surprise, the frog is still alive and can actually speak. Pyonkichi the mischievous grof causes mayhem for Hiroshi and his friends at every turn. As a spirit living on Hiroshi's shit this gutsy frog is certainly ready for some fun adventures!

(Source: Mangamo)