A cartoon about teens(?) turning into dinosaurs.

Do you know what it's name would be? I remember a few things about it. A jock which could turn into a trex, a nerd turning into a triceratops, a girl who turned into spinozaur and that's it about the main characters. They took care of leekages of some kind of mutagen that turned animals into monstrosities straight out of Jurassic park. And that's it what I remember from the cartoon itself BUT I remember something about the channel it was streamed. Before some show began, there was a merchant in a... death wagon? It was made in a way that the show appeared as if they were stories told by him. One of oldest memories. Sorry for a bit slurred writing, I didn't sleep for 36 hours now.