Yes, Isaac Deuwese Fonda and Rebecca Groesbeck had a daughter named Rebecca, who was born on January 14, 1787 and baptized in the Schaghticoke Dutch Reformed Church on February 14, 1787.There were no baptismal sponsors recorded for Rebecca Fonda baptism.
A transcription of the Baptismal Records of the Schaghticoke Dutch Reformed Church is posted on the Rensselear County Gen Web page.The following is the information that I copied from those records on Isaac Deuwese Fonda and Rebecca Groesbeck.I am sorry that I can not format this information nicely for you, but I felt that accuracy was more important in this situation.
Fonda, Isaac and Rebecca Groesbeck; Rebecca; 14 Jan 1787; 14 Feb 1787; none recorded Fonda, Isaac and Rebecca Groesbeck; Cornelius; 17 Jun 1780; none recorded; Aaront Van der Kar and Rebecca Fonda Fonda, Isaac and Rebecca Groesbeck; Henderickye; 13 Nov 1777; none recorded; Peter Viele and Elizabeth Fonda Fonda, Isaac and Rebecca Groesbeck; Peter; 28 Jun 1782; none recorded; Peter Groesbeck and Alida Van Arnum Fonda, Isaac Deuwese and Rebecca Groesbeck; Maria; 30 Jun 1775; none recorded; Matthew De Garmo and Maria Groesbeck.
Isaac Deuwese Fonda lived some where in the Saratoga District of Albany County.The Saratoga District contains the present day towns of Stillwater, Saratoga, Northumberland, Moreau in Saratoga County and the towns of Ft. Edward, Greenwich and Easton in Washington County.The Schaghticoke Dutch Reformed Church was within a stone's-throw of the present day Easton/Schaghticoke town boundary, which is also the present day Washington County/Rensselear County line.The Schaghticoke Dutch Reformed Church was located well north of Troy.Since there are other Fondas who lived a whole lot closer to Troy, I would suggest that you might want to check all of them out before making a decision about the identity of your Rebecca's parents.
It has been 30 years since I have lived in Albany, NY.However, I do not remember ever hearing of a place called Candajagy.My first reaction was that it might have been a misspelling of Canajoharie.Canajoharie is northwest of Albany on the Mohawk River.Canadaigua is south of Rochester and was not settled until after the turn of the 19th Century.
You might want to take a look at Isaac I. Fonda (1753-1826) and his wife Antje Van Sandvoort, who lived in Cresent (present day Town of Half Moon, Saratoga County, NY).Cresent is slightly north and west of Troy and very close to where the Mohawk River flows into the Hudson River.
In looking at some of the other postings on the Fonda Family Genfourm message board, I would be inclined to suspect that Rebecca was a fairly common Christian name in the Fonda clan.