Yes. The Mini French bulldog is very stubborn, so is the standard sized Frenchie. While their stubbornness comes off as cute and amusing, it consumes more time than usual while training French bulldogs. It takes patience and effort.
It is advisable that you keep the training session short but fun. Your dog will not feel bored this way.
One important thing to keep in mind is that when training, you should cheer for them. Let your dog know how good of a job they are doing. Sing praises to them and give them treats for rewards. They easily get motivated by food.