Baby garter snakes would be far more concerned about getting away from a likely hysterical human. The worst that they would do is secrete a foul smelling discharge which is hard to wash off because it is a musk and would be very gross. While any animal could bite if you were talking about small babies their teeth are not really big enough to do much at all.

I have kept many reptiles and been around a lot of snakes and other assorted creepy crawlies in my life time. I always feel so sorry for the reptiles in shows such as fear factor because they get tossed around by hysterical contestants and I have seen species such as king snakes (which eat other snakes) thrown in with corn snakes and so on.

My best suggestion for a creepy crawlie that would bite a little bit but cause no damage and be very gross would be super worms. They are scientifically known as Zoophobas mario and are the larval stage of this particular beetle. They look like very large meal worms and because they are commonly fed to reptiles, easily obtainable in large amounts.