I have learned to not expect hatchling ball pythons to take frozen / thawed, becuase they typically won't. Most of mine have been willing to switch at about a year of age, but not much sooner than that. I have had some that have gone on "hunger strikes" right after I have tried pushing frozen / thawed at them when they were real young. Now I just go along with the live feeding thing until they are bigger, chubby and approaching a year of age. I had great success this summer switching almost all of my yearlings to frozen / thawed dangled on tongs outside the door of their hides. They always seem to have a better appetite in the summer, and I capitalize on that and get them switched over.