Yggr bears Trollz as mature adults, ready to function in society and take on their roles. When one of the Trollz dies, he is immediately replaced by a new one. Yggr always keeps a few embryos with a different set of genes. When a Troll is needed, a suitable embryo instantly becomes an adult specimen and is released.

Source and More information: Who are the Trollz?

Author: indieDB.com