>>>The "happy" Buddha. (The chubby one with the big smile.)<<<The one with the big belly? That's not Buddha, it's Hoi Toi (a common mistake)
Hoi Toi was an elderly man who was left behind to watch over the women of the village while the men went off to war for a year or two.
When they returned there were lots of new babies and pregnant women in the village. Hoi Toi had a big smile on his face.
He was cursed with a big belly so he would forever appear pregnant but it didn't make his big smile go away.