Lizardfolk would be hatched that way. Not like some magical mutant mix of a lizard and a human. Like the Argonians from the Elder Scrolls or the Sliths from Avernum (or Exile, if you go that far back). There are plenty of other examples. As for halflings, you are using that term to describe a half-human, half-lizardfolk, right? I'm not sure that such as union would be compatible.