Nice question. I think the closest thing to a creation myth that we have is the Mutinapaskan Nobara ("The Birth of the Land of Whales") left to us in our famous Mutinka inscriptions.
Mutinkas, ("the Whale People", from the word "mutin", meaning "whale") were the original inhabitants of the Frieden-und Freudenlandian archipelago. Their language is known as Mutinosan ("osan" is a suffix used for languages) and they called our archipelago Mutinapas ("Whale Land"), while "-kan" is a genitive suffix. As I am sure you can all guess by now, "Nobara" means "birth."
Interestingly, Mutinkas' language was closely related to their mythical conceptualization of the world. For one thing, they believed that they descended from whales, and also that deceased people would be reincarnated as whales. That should explain why they called themselves "The Whale People."
The abovementioned story is quite crazy and mindblowing. It goes like this:
"In the days of old,
Before humans populated the Earth,
Only whales populated the mighty seas.
Por-Mutin ("Great Whale"), that charming goddess,
Looked upon the world and felt despair,
As the world was all water, no land.
So she collected some dead whales,
Piled them on top of each other,
And they became Mutinapas.
Then she found some pregnant whales,
Made them go into labor,
And became a midwife to their calves.
She wanted the calves to live on whale-land,
But that was impossible.
So she cut off their fins and gave them feet.
She made them smaller, to fit more of them on the whale islands.
She changed their skin, their visage,
and gave them a new name: Whale People.
And so it is that the Whale People came to be,
On this bountiful Whale Land,
Born of whales and nursed by whales,
Eating the fruit of the soil
That was once the body of a whale.
From the sea we came, to the sea we shall return.
Mutinora fola biku. (To the whales, praise be.)
I find this fascinating, because dolphins are our national animals even today. Looks like the inhabitants of our archipelago have always been in love with aquatic mammals, one way or another.