I did play with a lot of them, obviously..
teeth command? oooooh i like that one! how did you do it?
I taught him speak first... a lot of times he'd just snip at me without making noise when I gave the speak command, so I'd taunt him with a treat without a command and when he chomped his teeth at me I said "Teeth!" and gave him the treat, and repeated, he caught on fast.. It's easier with a dog who already does it - all I had to do was catch the behavior and mark it with a word..