Yes: the Brunali (Icheb's species)
The Borg assimilation speech succinctly describes the actions that the Collective intends:
We will add your biological and technological distinctiveness to our own.
From Icheb's assimilation, we know that the Borg acquired Brunali biological distinctiveness. In "Child's Play" (Voy 6x19), when Voyager travelled to the Brunali homeworld to return Icheb to his people and his family, we see that the Borg, in their typical scoop-up-cities fashion, had also sampled Brunali technological distinctiveness:
The next part of the assimilation speech describes the targeted group's post-conquest status:
Your culture will adapt to service us.
There's no reason to suspect the Borg of propaganda or deceitful wordplay. Taken literally, this part of the speech does not say that the culture will be incorporated into the Borg Collective, nor that the culture will willingly accept its new role and act in the Borg's interests. The Collective, from its point of view, is simply stating the fact that it can do whatever it wants according to its own timetable.
In the case of the Brunali, the Borg plan called for repeated visits to the planet to harvest biological and technological distinctiveness. If the Borg had considered the Brunali a threat — for being prominent founding members of a strong interstellar federation, for instance — then the assimilation scope and timetable would likely have been accelerated as it was for Earth in First Contact.
Since the Borg valued the Brunali as resources and did not consider them a threat, the Collective was content to let the remaining people exist and adapt in service to the Borg, rather than obliterating the culture. The fact that the Brunali adapted in ways hostile to the Borg was irrelevant, resistance being futile after all.