I can remember MU using both the Big Green and Thundering Herd. Thundering Herd had been used since the 1920's. We still use both names in different ways.
"In 1958 the Marshall student body, without input from the faculty, administration or alumni, decided that two nicknames wouldn't do and held a vote to settle the issue. Along with Thundering Herd and Big Green, one group of students bought a turkey as a suggested mascot and promoted the name Green Gobblers.
The students voted on Big Green as the nickname, but the media continued to use Thundering Herd to refer to the teams.
In the fall of 1964 Marshall president Stewart Smith appointed a faculty-student committee to suggest a more permanent nickname, feeling that Big Green denoted no action and was not appropriately symbolic. The nine-member committee narrowed its field to Big Green, Thundering Herd and Rams, which had been suggested by Huntington businessman Leonard Samworth, a past president of the alumni association.
On January 5, 1965, over 85 percent of the Marshall students picked Thundering Herd above the others and chose the buffalo as the official mascot and green and white as the official school colors."
https://herdzone.com/sports/2018/6/11/mars-trads-html.aspxI can remember Mr. Samworth, who owned the Ohio Valley Bus Company, pushing the name of Rams "Rally Around Marshall". My Mother was attending summer school at MU working on her Master Degree in the 1950's. She took me into the MU Bookstore located in Old Main to get me a Marco t shirt, I was attending summer school at Jenkins Hall while she had classes. I wish I had saved that shirt.