There seems to be a discrepency and lack of definition as to what differences there are between "above ground" and "kiddie pool".
Here are the both of them defined by the manufacturers.
1. Above Ground= swimming pools that have an exterior wall of machined sheet metal construction formed into a continuous circular or oval shape. Support or reinforcing posts are located around the perimeter of the pool and serve to strengthen and maintain the pool wall in the desired position. Conventionally, various components make up these post assemblies and may include upper and lower rails for engaging and covering the upper and lower edges of the metal pool wall, some form of plate connectors which serve to mount the vertical posts in position and which may also be used to secure sections of ledges around the top of the pool wall. Some form of cap is usually fastened to finish the top of the post assembly. These are usually sold by companies such as Kayak Pools, Doughboy, Paradise Pools, etc.
2. Kiddie Pool = They contain from less than 200 but no more than 4,000 gallons of water. They are no deeper than 3 feet and no larger than 15 feet in any dimension. They
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have no filtration, or small combined pump and filter units. These are 'installed' by the purchaser and are sold for use by children. They are usually made from pliable plastic and are sold by stores such as Target, WalMart, Meijer, etc.
With both of these being clearly defined, I think that we can understand that what is being seen in the yards of residents are clearly within the "kiddie pool" definition, though probabbly bigger than you would usually think of a kiddie pool.
Hope that this helps.
Have a great day