This is the Third avatar of Lord Ganesh

                                                               There are Eight avatars of Lord Ganesh 

Mahodar:

At the point when Kartikeya had slaughtered Tarkasur, then the King of evil spirits, Shukracharya had made Mohasur to execute all the Gods. To be free from Mohasur, all the Gods loved Lord Ganesha. 

That time, Ganpati took the third symbol of Mahodar. Mahodar had an enormous stomach and he had gone to execute Mohasur riding on a mouse. When he arrived at his town, Mohasur got terrified and made Mahodar his God.