Jenn,
No, but I recently found a source for them from a private breeder/collector...He acquired these neotenic tigers, didn't breed them. However, I was interested in obtaining information about breeding neotenic tigers and possibly trying it with this source if I could get some specifics about it.
I've read several articles about the initial crossing with axolotls (Voss?), but I think it involved more than your typical 'put them together when the time is right' methodology. Not 100% but I think they manipulated it on some cellular level?
I was also told tigers that are neotenic, being facultative neotenes, could go through metamorphosis if taken from their normal environments, whether it be a captive or natural situation?
I'd love to try it if it's feasible.