Fort Myers, FL
Could not confirm a Pretzel King listing on the current Fort Myers Downtown, Lakes Park, or Sanibel Island vendor rosters. A soft-pretzel vendor called "The Pretzel King" operates in the nearby Sarasota/North Port, FL area (Sarasota Farmers Market listing; @thepretzelking_northport on Instagram) — possibly the same traveling vendor, but this could not be confirmed as the Fort Myers/Sanibel market vendor specifically.