There are two officials in a game of rounders and one stands on the batting line to check for low/high balls and the other one stands just behind 2nd post to check for wide balls.
The officials vary, but there are two referees and two linesman during a hockey game.
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16 football games during the regular season
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there are 4 officials in an NHL game. 2 referees and 2 linesmen
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Five innings constitute a game of rounders
baseball
There is one referee and six other officials on the field during an NFL game. Click on the 'NFL Officials' link on this page to see the duties of each official on the field and what equipment they use during the game.
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There isn't a name for rounders in French because it's not a French game.