"Farm share" is used interchangeably with "CSA share" — the same model. Some farms prefer "farm share" because it's more recognizable to customers unfamiliar with the acronym. The mechanics are identical: pay upfront, receive weekly produce (or meat, dairy, flowers) through the season.
Glossary · Selling
Farm Share
A synonym for CSA share — a subscription purchase of a portion of a farm's harvest, delivered weekly over a season.