Do whale sharks have scales

Answer 1

Whales are mammals and have never had scales, so no. Killer whale, dolphin, porpoise, and sperm whale teeth are modified bones in their skull and jaw, just like ours. Baleen whales, like humpback and blue whales, have large carotene plates growing out of their jaws instead of regular teeth.

Answer 2

Yes, just like every shark.

"The Whale Shark's skin is thicker and tougher than any other species in the world, reaching up to 14cm in thickness, and is covered by dermal denticles" (Taylor, 1994)

Taylor, J. G. 1994. Whale Sharks, the giants of Ningaloo Reef. Angus & Robertson, Sydney, 176 pp.