Did the aztecs have mythical creatures?

Question

like the celtics believed in faeries, the vikings believed in trolls etc. stuff like that

Answer 1

well not really but they believed in demons from h**l.

Answer 2

Yes.  They had several gods that resembled animals (i.e. Quetzalcoatl, a creator god resembling a great bird).  They also had several mythological creatures:

Ahuitzotl - a man-eating water-dwelling dog-monkey with a hand on its tail

Cipactli - the caiman at the foundations of the earth

Cihuateteo-the spirits of human women who died in childbirth (mociuaquetzque.)

Nagual - a tutelary animal or vegetable spirit

Nahual - a shapeshifting sorcerer or witch

Tlaltecuhtli - a toad goddess

Hope this helped!