Only the owner can see the dragon's info page. If you do not own the dragon you will see the message "You can't seem to find the dragon you're looking for."
The image for a fogged dragon is the same image for the Glitch Dragon.
There is currently a glitch where the egg of a Nocturne Dragon shows up as fogged on an incubator.
One cannot use any BSA (Breed Specific Action) such as Influence on a fogged egg. The egg must be unfogged for the BSA to take effect.
When an egg is fogged it will temporarily change the sprite so nobody can see it.
- TJ09 (full credit)