A mantacore is similar to the Egyptian sphinx. It has the body of a red lion, and a human head with three rows of sharp teeth (like a shark). Other aspects of the creature vary from story to story. It may be horned, winged, or both. The tail is that of either a dragon or a scorpion, and it may shoot poisonous spines to either paralyze or kill its victims. The creature's feet may be those of a dragon, but are most often described as the paws of a lion. Its size ranges from the size of a lion to the size of a horse. It is also mistaken as a bearded man when seen from a distance.
A griffin is a creature with the body of a lion and the head and wings of an eagle. As the lion was traditionally considered the king of the beasts and the eagle was the king of the birds, the griffin was thought to be an especially powerful and majestic creature. The griffin was also thought of as king of the creatures.
Manticore is a different species altogether with its origins in Persia as the word "Manticore" is a native Persian (Farsi) word meaning Man-eater... sigh... Not all creatures look the same or have the same characteristics you know... just as humans exhibit differnt phenomes; eye colour, skin colour, height, weight, etc...