User blog comment:Kaido King of the Beasts/Chapter 937: Starving for Action (and Shiruko)/@comment-31036366-20190323015654/@comment-2600:1702:3C50:A6E0:60F2:FCCB:6794:4D1A-20190323141728

They were indeed in the manga, the anime just gives them more emphasis as it usually does for minor characters.