") All of these, of course, imply immediate and unquestioning obedience to the speaker, even at the risk of looking ridiculous (when imitating a frog). Oddly enough, I clearly remember the first time I heard the frog version of this expression. It was my mother-in-law at a family party, describing one of my father-in-law's cousins.
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"When (I,you,he/she) say from, they jump" means that (I/you/he/she) have/has power and influence over others, so others are doing as you say they should.