oooooh yeah there are. I'm surprised you haven't heard of them. Especially southern French have a very strong accent that can be spotted immediately. There are some funny accents in Auvergne and Alsace also. Some other accents don't sound very nice to my opinion, so I won't mention them here

As you probably know, there are also local languages as well, still alive in Alsace (where even young people use it between one another), Corsica, and Bretagne.

CRC