Pretty sure they're just fat.
Those are called "fat dogs" an increasingly common breed in the US.
My money's on American Bully. Some of them have longer legs, but this is the more typical look. We have a few in our neighborhood, and from a distance, they look exactly like the ones in your picture. These are a few shots from the all-knowing net:
Fat, smelly, bad breath and ornery,Look English to me. Neighbors had a pair, they were fat, smelled, had bad breath and were ornery. Miz Diane likes Frenchies but we've never had brachy dogs. Boston Terriers have always been appealing (and I've known a couple great ones) but all the brachy dogs have too many health issues.
Give me a mutt with a regular nose, a dry mouth and legs to run. Our first was named "Roxanne" 'cause her nose was so long...