DeSean Jackson -- PROFESSIONAL BREEDER ... Who Wants to Buy My Puppies?!

Another ex-Philadelphia Eagles player is in the dog business ... but DeSean Jackson ain't fightin' em ... he's sellin' em ... telling TMZ Sports he's a professional puppy breeder now.

The NFL superstar posted pics this weekend -- showing off his American Bully (American Bulldog / American Pit Bull Terrier mix) with her brand new litter of pups ... 11 in total.

So, when we ran into D-Jack in L.A. this weekend -- we had to ask what he was planning to do with the lil' guys. Turns out, the Redskins WR is now in the breeding biz.

No word on how or where or who will be getting the doggies -- but they're pretty damn adorable.

Fun Fact -- Jackson hit up a charity kickball game in L.A. over the weekend too ... and found time to hang with his "homies" Kylie and Kendall Jenner.

For the record, Kendall's 18 and single ... and DeSean seems to have all of the qualities the women in that family seem to dig. Pro athlete, famous ... and you know ... that other thing ... rich.