Golf, Disc Golf, Frolf, and Calvinball
Here are the major differences between Golf, Disc Golf, Frolf, and Calvinball. Generally stated, they form a continuum from the very structured, athletic prowess, and rules based; to the completely anarchistic and purely creative.
Golf and Disc Golf have leagues, explicit rules, winners, and losers.
Frolf and Calvinball have neither leagues nor winners. Frolf and Calvinball allow anyone, beginner or advanced player, to win.
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Source: Golf Rules, Disc Golf Rules, Frolf Rules, Calvinball Rules