Can't think of one reason why you wouldn't want to put it in your mouth!
The Blowfish is not affected by normal gravity and floats in the air. Bubbles come out of its mouth. When lit on fire, it explodes and only the eyes and spikes remain.
Catfish COMBO = Kitty Kitty Poo Poo Plushie + Blowfish
Deadly Fish COMBO = Blowfish + Discount Sushi
Underwater COMBO = Blowfish + Miss Hexopus