These are stands set up typicaly on the side of a road or market that deal in fruits and often vegatables. From my experiences they have a certain item that they specialize in (around here it seems to be tomato and in tropical areas it seems to be tropical fruits). Such stands can be easily related to lemonade stands in the way that they are "owned" by one person and deal in cash (allowing the profits to go without being claimed). Often these stands have the best produce because they are not tainted by as many chemicals as the produce in stores.