Look into Kek (Egyptian deity with a frogs head), and 'kek' being the sound people make when holding in a laugh (or subtly laughing). Also 'Shadilay' P.E.P.E meme magic.
It started from 1 guy though a 'Feels good" character and then just exploded into existence as a /pol meme.
It was good fun while it lasted, literally 1000's of different Pepe's, which then gave birth to Apu's, before settling down now into occasional frog posting to this day.