This is a crocodile amulet with crossed striations for scutes on the back. There is a carved loop for suspension under the belly. Throughout ancient Egyptian history, people wore amulets of crocodiles as protection against actual crocodiles.
From Egypt, Sheikh Farag SF 543 debris in A. 1923: excavated by the Harvard University–Boston Museum of Fine Arts Expedition; assigned to the MFA in the division of finds by the government of Egypt.
Harvard University—Boston Museum of Fine Arts Expedition