Re: Frederick Sauder
You should look on the Souder and Souders boards for more on this name.You're using one of the early spellings but it's changed over the years.
This MAY refer to the Frederick Sauder you're searching (but you'd have to do more work to establish that)
On the Osgood:
[List 157 C] Osgood
Captain: William Wilkie
By Way of: Cowes
Arrival: Philadelphia, 29 Sep 1750
Gottlieb Mittelberger was one of the passengers on this ship.
Johann Frider Sauter
If you do establish that this is the same Frederick Saud/ter, then look for an account of the voyage by Mittelberger (just Google his name). It's unbelievably dramatic and sad.