Here´s his birth cert.
Lütjenburg 1801
Johann Hinrich Frobös zu Wentorf. Johann
Hinrich Frobös, Musqurtier bym Schleswigster
Infantrie Regiment, und Katharina Sophie Jann
sen, vorgeblich ehelicher Sohn, auf der Reise geboren
Gevattern:
Marc Hinrich Jopp
Johann Hinrich Lattendorf
Catharina Maria Ahrens
Henning Friedrich Rönnefeld und Detlef Rönnefeld
--------------------------------------------------------------
Johann Hinrich Frobös from Wentorf. Johann
Hinrich Frobös, musketeer in the Schleswig infantry regiment
and Katharina Sophie Jannsen, alleged legitimate son
born on their journey through.
Witnesses:
Marc Hinrich Jopp
Johann Hinrich Lattendorf
Catharina Maria Ahrens
Henning Friedrich Rönnefeld und Detlef Rönnefeld
Seems like they were on their way from Wentorf, near Hamburg, to maybe somehere further north.
They were forced to stop in Lütjenberg so she could deliver her child.
So i think they lived somewhere in the vicinity of Copenhagen.
That meaning searching danish records to find other siblings of Johann junior:
Dave