I work at a vet clinic and we always like making names up for mixed breed dogs.

Here are a few:

dox-a-chi or dox-ahuahua (doxie & chihuahua)

Pom-Chi (pomeranian & chihuahua)

Labradoodle (lab & poodle...actually going to be a breed soon)

Schnoodle (Schnauzer & poodle...supposedly already a breed)

Malti-poo (maltese & cockapoo)

There are a few others, but I can't remember them. I love seeing mixed breed dogs, seeing which attributes they get from the breeds is neat.