>>6896181The only thing in common in most cases is that it's a frog named Pepe.
And that's not always the case either. Frogposting has stemmed off into Easter Toad, Apu, Wednesday Frog, Popo, Kek, etc.
And before that, Foul Bachelor Frog was a popular frog meme during the macro image era though not now associated with frogposting.