Chondrichthyes have toothlike scales called Dermal denticles or placoid scales.
From the en.wikipedia.org
Sharks and rays belong to a group of fish called chondrichthyes, with skeletons of cartilage instead of bone.
From the washingtontimes.com
Chondrichthyes also lack ribs, so if they leave water, the larger species'own body weight would crush their internal organs long before they would suffocate.