Yep, it's milquetoast but yeah it just means milk toast anyway.
Apparently it's from the name of a character: https://www.etymonline.com/word/milquetoast
"timid, meek person," 1938, from Caspar Milquetoast, character created by U.S. newspaper cartoonist H.T. Webster (1885-1952) in the strip "The Timid Soul," which ran from 1924 in the "New York World" and later the "Herald Tribune." By 1930 the name was being referenced as a type of the meek man. The form seems to be milktoast with an added French twist; also see milksop.
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