Will my hermit crab kill my turtles?

Well I want to get a hermit crab but the problem is I have 2 pretty large baby turtles that are about 1 yr old i think! is it a good idea to keep them together or should I keep them with my fish and if i keep them with my fish will the crabs kill them. more importantly are there claws big and will they pinch me? I KNOW THIS IS LONGGGGG SORRY