Change a frog's variant type using a vanilla/survival-friendly method. Works with vanilla (cold, temperate, warm) and optionally 'More Frogs 2' variants: crimson, ender, infernal, poison dart, purpur, sculk, spirit, warped, and wood.
With the More Frogs 2 mod running, you can have your frogs cycle through 12 different variants. Without the mod, it's just the class 3 variants, but that's still fun.