Pufferrot = puffer fish + parrot .: puffer fish eats hard-shelled meaty food and parrot eats grains.... so i guess pufferrot eats "GRAINY SHELLS" ...
hIPPOCRAB = HIPPO + CRAB .: HIPPO eats plants and crab eats dead meat from the sea... doesn't matter what... so i guess Hippocrab eats "DEADLY MEAT SEAPLANTS"...