Of course, yes. Friendica Groups are special accounts (just like Lemmy communities, which are also activitypub groups) and, like all Friendica accounts, they can also be managed in a delegated manner by another profile of the same instance.

Friendica groups are very powerful tools, but always remember that Friendica Groups have a social interface that is less intuitive than that of Lemmy communities, which instead have the simplicity of forums