Marzoll is a small village with Castle (same name) next to Bad Reichenhall in Germany (Bavaria) close to the Austrian boarder thus just a few kilometers from Salzburg city.
The Fr"oschl von Marzoll were a noble family, owner of the castle an very rich people in the middle age.
Origin from this family is quite unreasonable, but descendance from a family from this area/village is quite possible.
Maybe they have any information at th local archive:
Stadtarchiv Bad Reichenhall
Rathausplatz 1 und 8
83435 Bad Reichenhall
GEMANY - EUROPE