Hi Rashaan I thought I'd assist you in your quest for information. First you probably should know that you are Misusing the word Creole. The origin of the word possibly came from several different sources and has many spellings but as it applies to Louisiana history, it refers to white people in Louisiana who's ancestry originally came from France, not Acadia. In recent years the word has been bastardized to include mixed race people from LA. That however is not it's true meaning and definetly does not mean black people from LA. I concede many people are ignorant to what it really means and it has become a buzz word for many blacks but you should know the truth when posting on a Genealogy Forum.
The Dugas were not some of the first to settle in Louisiana. The Abraham Dugas family who settled in Louisiana for the most part were cajuns, from Acadia. I do understand that Abraham did have a son(s) that returned to France before settling in LA but the Dugas didn't begin settling in LA until the late 1700's. In fact by the time Abraham Dugas was born in frace in 1590 Lousiana was already being settled by French and Spanish settlers.
Sadly it seems there are some black people out there who like to falsely lay claim to white descendents. Thomas Jefferson's legacy was abused for years by misguided black people who thought they were his decendents. Recently it has all been dicredited by DNA and family records but it shows how it can happen and this is why I am suspicious of many claims. I have been studying the Dugas line for many years and have never heard of Joseph Knatt. The Jean Baptist Dugas 1802 you are refering to is shown to have had 5 children, none named Joseph. Illigitimate kids often aren't shown in family history so it may be possible but I have never heard the story you are telling. I find it sketchy that a Joseph Dugas would go by the name Joseph Knatt. If it did indeed happen, it may be possible he found his father wasn't the Dugas and changed it out of resentment. I'd say that there is where the real questions lie. Many issues like this are lost to history because actual documentation may never have existed and word of mouth died away generations ago. I wouldn't hang my hat on stories, especially sketchy ones that are many generations old. Best of luck in your search!