The Frogs began life in 2005 as an announced expansion franchise in the National Premier Soccer League, but they failed to take to the field in their original season. They finally made their debut in 2006 and impressed immediately, finishing their freshman season with a 12-4-4 record and second in the table behind eventual national champions Sacramento Knights. The Frogs played in PAL Stadium in San Jose in 2006 and 2007, with good support from local soccer fans who were left without a team when the San Jose Earthquakes, a Major League Soccer team, relocated to Houston and became the Houston Dynamo.
For the 2008 season, the Frogs moved to a new home ground, James Lick Memorial Stadium on the campus of James Lick High School, an artificial turf field with permanent American football lines. Also in 2008, the San Jose Earthquakes returned as an expansion franchise, bringing top-flight soccer back to the area. These factors reduced the size of Frogs' crowds considerably, but did not seem to affect the on-field product, which was at times very impressive. They started the season strongly, with three wins in their first four games, including a 3-1 win away at San Fernando Valley Quakes that featured a brace by Andrew Wiedeman and handed the Quakes their first home loss in almost 2 years. However, after this promising start, the rest of the year was one of frustrating inconsistency, in which a dominant win (2-0 over Southern California Seahorses), would be followed by a disappointing loss or a tie. The Frogs did make a finale late push for the playoffs, winning three of their last five games, including a 4-1 over Lancaster Rattlers and a dominant 3-0 away victory over San Francisco Seals on the final day of the season, but in the end it was not enough; they finished the season comfortably mid-table in 5th position. Andrew Wiedeman was the Frogs' top goal scorer with 6 for the season, and also contributed a team-best 3 assists.
In August 2008, the Frogs organization announced that the franchise was closing down, citing a "lack of community interest in top amateur soccer" for the team's demise. The team's attendance dropped significantly in their final season to a mere 20 paid tickets a game.