This article[1] told who's the creator of Pepe coin.
[1] Zachary Testa Identified as Pepe Coin Founder Following Price Crash
Mark Zuckerberg is more interesting. Zachary Testa could be another Craig Wright faking to be the founder of a popular meme coin or is a disguise created by zuck himself.
PEPE coin's logo resembles the people from the planet of zuckerberg and he might have created it as a tribute to his folks.
Not sure if Mark is there but it's likely that he's going to be interested to any other cryptocurrency project anymore.