bite off definitely not. I don't even think it could cut your fingers but they do have a ridged line that I *think* is bone but in the shape of small teeth. I've been bit before but never cut. Others may have more insight or other conclusions.
My oscar is a tiny fella around 4-5 inches but if I'm dropping food into his tank and dont move my fingers out of the way fast enough, he gets in a free nibble or two. Amazing that he's that chunky and can jump so high. lol