"Buck teeth" refers to teeth that stick out from the mouth, usually the front teeth. It is used to describe someone who has prominent or protruding teeth. Full definition
I sort of like to think of them as buck teeth, too. (kitchentreaty.com)
His teammates call him «Castor» (it means Beaver in French)-- but not because he trains so hard; because he has slightly buck teeth. (si.com)
Imagine a menacing 30 - foot tall Easter Bunny with five - foot long buck teeth, and you can begin to understand what it was like to be Clair Shumon Turner. (articles.chicagotribune.com)