Twin seedlings
Another common mutation found in cannabis is polyembryonic seeds. Polyembryonic seeds contain more one seedling, and when germinated, will surprise their owners by putting out two taproots instead of one.
If carefully handled, it should be possible to remove the seed casing after a day or two and gently separate the two seedlings. Once separated, the two seedlings should happily grow into two healthy plants—and interestingly, while one of the two plants will be the normal offspring of its mother and father, the other will be a clone of its mother.
Although two seedlings are more common, some three-seedling polyembryonic seeds have also been observed. However, while this is an interesting mutation, it does not confer much advantage to the breeder, and apparently no effort has been made to develop a true-breeding polyembryonic strain.
Heres the link where i got this info-
https://sensiseeds.com/en/blog/top-10-craziest-cannabis-mutations/