Female and male trolls are
1) Different
2) Have no need in each other too reproduce
3) Compete for same resources
Don't you see a huge potential for conflicts? Especially if we go underwater troll route. Female night trolls and male night trolls are very very close to being different races
I am not sure that they can mate with each other. And even if they can... humans and elves can mate, too. That doesn't make them one race
Pretty much all of that is true for humans, too, and you don't need millions of people to reproduce. We work together anyway. Besides, if we are even halfway decent at choosing a recipient for the gift, we'll choose someone that works well with us.
Let's say about as many kids as we intend to have, over the course of our respective lifetimes.
Our lifetimes are looong. Why can't you let daughter(s) of Alice to reproduce if you really want competitors to our sons? Besides what is bad in having only male trolls, again?
1. Not competitors, associates. And why not both?
2. Nocteclaw gave us a gift to make female night trolls, she likely wants us to make female night trolls. Let's not anger him/her.
Last wish of our father. Also a consideration most of us have.
It's not like we loved him much... And I suspect that he disliked female night trolls, that fits his character
Besides there are another way to recreate night troll race. Make a nation, not solitary families scattered around the world like it was before.
So? He sent us forward in time.
That's my intention, and it works better with more night trolls.
Not slave, just not antagonising her. Besides, s/he does kinda have a right to us, and as a god/dess has the ability to royally screw us over if we anger her.
Doing anything to not anger = slave
Not "doing anything not to anger her." Besides, it's always good to get on gods' good sides. Gods help their servants.