I have noticed that the HC word "dejennen" sounds like "dejenne" instead. Is this correct? Mesi, Kreyol Lwiziyen

Yes, Haitians say dejene, dejnen, or dejennen.
These words are variations.  You can use whichever one.  They all mean breakfast.

Haitian Creole ↔ English Reference, Look up Haitian Creole and English Words