It is "in the back of my head." You might also say "the answer is on the tip of my tongue" if you have something that you almost remember, but can't quite.
Do you mean in Mythology? If so, then what your talking about is called the Griffin. It has the back half or full body of a lion, and the head of an eagle.
Moving the head back is called extension of the head
If the little hat on their head is what your talking about then it is called a HALO
occipital
If you're talking about the hair on the head, it's called a MANE. If you're talking about the hair on it's behind, it's called a TAIL.
These coins are called Indian head nickels or buffalo nickels but not "buffalo head". After all, they show the whole buffalo on the back, not just its head! Please see the question "What is the value of a 1929 US nickel?" for more information.
The little voice in the back of your head is often referred to as internal monologue or inner voice. It represents the inner thoughts and reflection processes happening within a person's mind.
hair
Head board
It is called a snapback because u can snap the size of your head in the back.. Snapback :)
There is no such thing as a "wheat head penny". They're either called Lincoln-head cents or wheat-ear cents because the back shows wheat stalks called "ears" (like ears of corn). Please see the Related Question for more information.
what are you talking about?