Do you know of any online phone book or resident searches I can use to potentially find decendants
No such thing exists. That would be illegal in Poland. Use Google and Facebook. How good is your Polish?
Do you believe this could be a variant of Foroszowski?
You would need solid documentation to determine that.
Any ideas here?
Ethnic identity in that region was very complicated and not clear-cut. Three brothers could identify with three different ethic groups, and often did. It may be impossible to determine with people who are no longer alive.