Wiktionary
football tennis
n. (context sports English) A sport played with a ball over a net on a tennis-like playground, with the ball similar to the football one, and the net to the tennis one.
Wikipedia
Football tennis
Footballtennis, also known as futnet (in Czech and Slovak nohejbal) is a sport originating in the 1920s in Czechoslovakia. It is a ball game that can be played indoors or outdoors in a court divided by a low net with two opposing teams (one, two or three players) who try to score a point hitting the ball with any part of their body except for the hands and making it bounce in the opponent's area in a way that makes it difficult or impossible for the other team to return it over the net.