Dattatreya Avatar
गुरुर्ब्रह्मा गुरुर्विष्णु गुरुर्देवो महेश्वरः | गुरुः साक्षात्परब्रह्म तस्मै श्रीगुरवे नमः ||
As per "Shripad Shrivallabha Charitra" Dattatreya have 3 Avataras
1) Shripad Shri Vallabha
2) Narasimha Saraswati
3) Akkalkot Swami Samartha Maharaj.
Read more about this topic: Narasimha Saraswati