robins

Cleveland's Player-Manager Tris Speaker and Brooklyn's Manager Wilbert Robinson meet at World series time, 1920: "In the 1920 World Series, the Cleveland Indians beat the Brooklyn Dodgers, then known interchangeably as the Robins in reference to their manager Wilbert Robinson, in seven games, five games to two. This series was a best-of-nine series, like the first World Series in 1903 and the World Series of 1919 and 1921. The only World Series triple play, the first World Series grand slam and the first World Series home run by a pitcher all occurred in Game 5 of this Series. The Indians won the series in memory of their former shortstop Ray Chapman, who had been killed earlier in the season when struck in the head by a pitched ball." en.wikipedia.org/wiki/1920_World_Series

William Joseph "Lefty" Glennon had been appointed Boston mascot in 1915.
rememberjamaicaplain.blogspot.com/2008_01_01_archive.html

A similar picture ran in Baseball Magazine with the caption:
"The rival mascots, Billy Glennon of the Red
Sox and "Red" Monahan of Brooklyn"
library.la84.org/SportsLibrary/BBM/1916/bbm182f.pdf

For Red Monahan, see

Art Siegel: thanks for finding more information on Glennon and Monahan. We will update the record.

Brooklyn mascot Joe "Red" Monahan. He was team mascot for 1916, and later went on to coach high school sports in Brooklyn. The story of how Hi Myers discovered him, while out of school with whooping cough sneaking into Ebbets Field, is told in a 1948 Brooklyn Daily Eagle article:
fultonhistory.com/Newspaper%205/Brooklyn%20NY%20Daily%20E...

Art Siegel: thank you for finding the name and background information on Joe Monahan. We will update the record.