Here's the rest, sigh, Kinja ate it the first time.
I posted this video earlier in a reply but it deserves it's own post, One because African Bullfrogs AKA "Pixie" frogs (Pyxicephalus adspersus) are bad ass and two because what did this guy expect? The frog was growling, it's unsurprising that it took exception to the "gentle" attempts at showing of it's smile. They have a good set of real teeth in the caudal part of their mandibles and those modified lower mandible hooks in front. They are big, up to 10 inches long not including legs and up to 5 pounds. Males employ those teeth and that bulk to battle for territory to secure breeding rights.
Check out this BBC "Life in Cold Blood" clip. It's like watching a really good kaiju knockdown/dragout when the slow motion footage starts.
They do make good dads. Not only will they aggressively protect their young, they will work hard to keep their tadpoles alive and swimming.