Thenn Warg

This ​Thenn ​is a character in the fourth season. He is played by Joseph Gatt. He is a wildling and a Warg.

Biography
He is a member of a group of Thenns led by Styr, the Magnar of Thenn. They are able to locate Tormund and Ygritte after he sees them through the eyes of his owl.

In the books
In the A Song of Ice and Fire novels, there are several skinchangers among the Free Folk, though none are specifically mentioned to be Thenns. Since he is grey-faced and bald, this character may be Varamyr Sixskins.