Here are the possible solutions for they bite but don't have teeth clue
Answer
Clue
Relevancy
tortoises
Clue
They bite but don't have teeth
tree
Clue
Its bark is worse than its bite, especially since it doesn't have any teeth
newt
Clue
Gingrich who said "females have biological problems staying in a ditch for thirty days because they get infections and they don't have upper body strength"
Definition
a tailed amphibian of the salamander family, also EWT