The waxy monkey tree frog secretes a fluid which they use like sunscreen!! They rub it all over their body!!
Some frogs don't go through the tadpole phase. There's also some frog (can't remember their name) that has an "oral birth"... Imagine little froggies crawling out of their mouth
(Edit: it's the gastric-brooding frog)
Axolotl are cannibalistic and can regenerate limbs, they're so cool.