The 'baby big mouth frog story' could be really fascinating. It may start with the baby frog being born with this unusually large mouth. In the story, the big mouth could lead to all sorts of interactions. It might be that the other animals in the pond are both curious and a bit scared of the baby frog because of its big mouth. The baby frog could use its big mouth to explore the world around it, like tasting different plants or even making friends in an unexpected way. For instance, it could use its big mouth to imitate the sounds of other animals and start conversations with them.
The central character is no doubt the baby big mouth frog. In addition to that, there could be a wise old frog that gives advice to the baby frog about how to use its big mouth properly. There may also be some small animals like snails or water bugs that are either friends or foes of the baby big mouth frog in the story. For example, the snails might be friends who help the baby frog find good places to hide, while the water bugs might be a bit of a nuisance, always trying to steal the baby frog's food.
I'm sorry, I don't know the specific 'big mouth baby yupik story'. You can try to find it in local Yupik cultural materials or ask people who are familiar with Yupik culture.
Since we don't have much information about 'big mouth story', it might be a story that revolves around the idea of communication and the consequences of talking too much. It could be about how a person's big mouth affects their relationships, whether it's with friends, family, or in a work environment. For example, in the story, the character with a big mouth might lose friends because they can't keep secrets, or they might get in trouble at work for gossiping. It could also be a story that uses the concept of a 'big mouth' metaphorically, perhaps representing a loud or outspoken group or community within the story.
One moral could be to think before you speak. Just like in the story where the boy spread false rumors without thinking. If he had paused and considered the truthfulness of what he heard, a lot of trouble could have been avoided.