1)
What is Shamen?
1.
Rashi citing Targum Yonasan: It is Eimsan (Radak - mighty men, that everyone who sees them, fear falls in his heart). 1
2.
Radak: It is rich and great people, like in Bereishis Rabah 67:6.
1
Radak: Shamen refers to healthy and strong, e.g. "va'Yaharog b'Mishmaneihem" (Tehilim 78:31).