I could not find anything in the transcribed church records of St. Peter & Paul in Nenno for these members of the Koll family. I also looked in the transcribed church records of St. Lawrence Church, where many of the counties early baptisms were performed. There are a number of entries of the Koll and Kohl families, but I do not see a John Koll married to a Margaretha. I purchased these church records from John Von Haden. See his excellent web site at www.washcowis.com
John has the transcribed church records, as well as family group sheets based on church records for Washington County. I checked for the Koll and Kohl families and there are quite a few listed in the surname section. Maybe you can sort out the various families by looking at the information he has listed.