Your question is unclear. You first say that your permanent resident card is expired and that you have applied for a US passport. If you are a Legal Permanent Resident you will not be getting a US passport. Regarding a your SS card, just call the SS administration office, they should tell you what to do.
Yes. Visit USCIS on infopass and have them issue you temporary evidence of permanent residence stamp. Also make a police report of the lost green card. You do not need to file I-90 if your application for N400 is already pending.
NYC EXPERIENCED IMMIGRATION ATTORNEYS www.myattorneyusa.com; email: email@example.com; Phone: (866) 456-8654; Fax: 212-964-0440; Cell: 212-202-0325. The information contained in this answer is provided for informational purposes only, and should not be construed as legal advice on any subject matter.