Amphibian: Just Gotta Ribbit

And Amphibia spin off

We know the story, there was the calamity box and within it three calamity crystals. But what if I told there was Four crystals. And one that powered the box on its own. And it belong to a new race of amphibians. And this race battle the dreaded core for survival. Sadly both sides fell, and the crystals were lost. Until now, follow the adventures of a highschool boy along with his trusty friends as he protects the city from threats of old and new. And his name, is amphibian