The words Quasimodo Geniti are not Danish, but they were used in Denmark. It is the Latin name for the first Sunday after Easter.
For genealogists, who are researching Danish ancestors, the term Quasimodo Geniti is good to know because that was the day of confirmation. Confirmation in the Church of Denmark was obligatory from 1736 to 1849. Confirmation records were kept by the parish minister in the parish registers aka church books.
The image at the top shows a typical Danish church with the whitewashed walls and red roof tiles. Malene Thyssen, photo of Villingerød Kirke; image copy, Wikimeadia Commons (https://commons.wikimedia.org/w/index.php?curid=217140 : accessed 20 April 2022), license: CC BY-SA 3.0.