Step 1: Understand the question.
We must find where a gomphosis joint is found. A gomphosis is one special kind of fibrous joint, so we need the matching example.
Step 2: Recall what a gomphosis is.
A gomphosis is a peg-in-socket joint. A cone-shaped part fits tightly into a hollow socket, held by fibrous tissue, with almost no movement.
Step 3: Match this to the body.
The best body example is a tooth sitting in its bony socket. The root of the tooth is the peg, and the jaw socket is the hole. This is the dento-alveolar joint.
Step 4: Rule out the epiphyseal plate.
The epiphyseal plate is made of cartilage and helps bones grow longer. It is not a fibrous peg-in-socket joint, so it is out.
Step 5: Rule out the pubic symphysis.
The pubic symphysis is a cartilaginous joint joining the hip bones in front. It is not a gomphosis, so it is out.
Step 6: Rule out the skull bone joint.
The joint between the frontal and parietal bones is a suture, a different fibrous joint, not a peg-in-socket type. So the correct answer is the dento-alveolar joint.
\[ \boxed{\text{Dento-alveolar joint}} \]