Lost Tale of a Lost Dwarven Tribe and Thranduil?

[Legate of Amon Lanc]

I was just reading the Hobbit and I came upon a very interesting part. At the end of Chapter 8: Flies and Spiders, we are introduced to the Silvan Elves who captured Thorin. We learn about their king (later named as Thranduil, father of Legolas, in LotR) and apart from that we learn about his only weakness which was that he liked beautiful (especially silver) treasures, we also read an interesting tale about why he didn't like the dwarves. If you are interested, read with me:

So to the cave they dragged Thorin-not too gently, for they did not love dwarves, and thought he was an enemy. In ancient days they had had wars with some of the dwarves, whom they accused of stealing their treasure. It is only fair to say that the dwarves gave a different account, and said that they only took what was their due, for the elf-king had bargained with them to shape his raw gold and silver, and had afterwards refused to give them their pay. If the elf-king had a weakness it was for treasure, especially for silver and white gems; and though his hoard was rich, he was ever eager for more, since he had not yet as great a treasure as other elf-lords of old. His people neither mined nor worked metals or jewels, nor did they bother much with trade or with tilling the earth. All this was well known to every dwarf, though Thorin's family had had nothing to do with the old quarrel I have spoken of. Consequently Thorin was angry at their treatment of him, when they took their spell off him and he came to his senses; and also he was determined that no word of gold or jewels should be dragged out of him.

"In ancient days they had had wars with some of the dwarves, whom they accused of stealing their treasure," it is said. Possibly as you might as well, the first thing I thought of were the Silmarils, that well-known history of Thingol being killed by the dwarves of Nogrod and the trouble afterwards. It seems that this is the story we are told here. Except for...
...except for that we have just the name "elf-king" here for the participant, and it looks very much like that only one, not two kings are mentioned in this tale. And this would be "our" king = Thranduil. Just look at the text where the words "(the!) elf-king" are used. If you put the word "Thingol" somewhere in the text, it wouldn't make sense (well, unless it was actually Thingol who captured Thorin&co.!!! ). This actually implies the idea that we are not re-told the tale of Thingol, but that we are told another, maybe similar, tale of Thranduil and some dwarven tribe (history repeating itself? It wouldn't be for the first time! Beren&Lúthien, Aragorn&Arwen, for example...). Maybe he had had some pacts with those enigmatic dwarves from the Grey Mountains (not Durin's folk, mind you!).
So, has anyone any ideas or evidencies which might bring more light to this matter? Have we just discovered an untold tale? Join the quest for truth!
How could the Nazgul take Minas Morgul? Do Balrogs have wings? Do the Barrow-wights ever wash their legs? (okay, I'm leaving this one out, might get a lil bit touchy!) WAS THRANDUIL THINGOL???

But seriously!