Sensi Seeds has Marley's Collie. It's a project they worked on dedicated to the late great Bob Marley. Unsure if it's lambsbread but collie means excellent ganja I think.
Depending on what you want, and have time for if you find a good cultivar you could select traits that suit you best and kinda recreate your own. Would take time of course.
I'll see what I can find out. A lot of Jamaican strains aren't really that high in thc actually. That's always fascinated me, kind of reenforces the existence of the entourage effect, because we all know there's good bud in Jamaica.