He can call them, but they will still admit you into the U.S., he cannot get your status revoked.
The above is intended only as general information, and does not constitute legal advice. You must speak with an attorney to discuss your individual case.
Your husband does not have this power to make ICE block you.
NYC EXPERIENCED IMMIGRATION ATTORNEYS www.myattorneyusa.com; email: firstname.lastname@example.org; 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.
While your estranged husband may continue to threaten you, your currently valid LPR status and the ability to re-enter the United States under that classification cannot be altered by your husband's accusations alone and by his indications that he will "report that you are a fraud". The original bona fide basis for your marriage was established to the satisfaction of the US Government at the time that you were issued your permanent I-551 "green card". His subsequent threats do not alter that fact. You should seek further professional advice from an experienced family law practitioner as well as from an experienced immigration attorney upon your return to the U.S. if you should happen to receive any further communications from the USCIS regarding your current lawful status.
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