Yes a ferret walks on all four legs
They bounce with both front legs together, and both back legs together. While doing a running walk they "slide" their feet; the left side moves together as does the right. All ferrets are different though and may prefer to run/ walk differently; especially if they are older.
How often to walk a ferret? There's not any established rules, it's more of a personal choice. One of my ferrets (now deceased) I would walk on a regular basis. Just showing him the harness, and he was ready to go outside. I currently don't walk my ferrets outside because I feel it is safer for their health. Ferrets can contract heartworms, pick up fleas and ticks, and other things from outside and I'd rather not take the risks.
Ferrets are only bred with other ferrets
The collective term for a group of ferrets is a "a business of ferrets" or "a cast of ferrets".
Panda ferrets the same as other ferrets, just the coloring is different.
Ferrets do not hibernate.
Ferrets do have a ribcage
The plural for ferret is ferrets but a group of ferrets is called a "business" of ferrets.
Wild ferrets - European polecat ferrets live in Europe. Black Footed ferrets live in North America.
Ferrets are not dangerous at all
Ferrets are in the weasel family
Yes, ferrets are mammals