Froak

Froaks are enemies from The Legend of Zelda: Skyward Sword. Frog-like avian beings found in the Lanayru Mining Facility and Ancient Cistern, if Link comes near them they will puff up and reveal a set of deadly spikes covering their entire body. When defeated, they self-destruct in an explosive fashion, forcing Link to utilize ranged attacks in order to avoid damage. The Gust Bellows can be used to blow them into a hard wall, causing them to explode. Alternatively, a Skyward Strike may be used when they are in range; however, this will only defeat them if they are not currently using their self-defense spikes.

Etymology
"Froak" is likely a portmanteau of frog, seeing as how it is reminiscent of a frog in appearance, and croak, a common onomatopoeia of the sound frogs make.