Do amphibians give birth to live young?

No, reptiles lay eggs that hatch into little reptiles.

Actually that's not entirely true, some species such as Boas are ovoviviparous (eggs hatch inside the body) and give birth to live young. Other snakes like Garter snakes also give birth to live young, can't remember any others off the top of my head.

there are also two types of lizards that give birth to live young these are considered ovoviviparous one type i know is the blue-tongued skink

Some lizards: Solomon Island skink Blue-tongue skink Shingle-backed skink Some chameleons: Jackson's chameleon Some snakes: All boas All vipers Garter snakes
Yes, rattlesnakes give birth to living young as do all of the venomous snakes in the U.S. with the exception of the Coral snake which is an egg layer>