hi! i’ve been thinking of an idea for a two headed troll, yellow blood named GATACA, DNA themed kinda! i was thinking maybe the second head started as a birthmark and then started growing as they matured so that they wouldn’t be culled Immediately at the sight of two heads! when it first started growing maybe it was easy to hide with a giant scarf or a hoodie maybe but once it grows into a full head i’m trying to think of how they could hide it. I thought maybe it could have something to do with telekinetic powers since they’re a yellow blood? Or maybe by the time it’s grown into a full head they’re able to stay in their hive all the time and they have a trusted friend go out and do stuff for them if they need? Any thoughts? Thanks!
A second head is definitely a tricky one due to the sheer size and visibility of it. Your "birthmark that grew into a head" thing is probably the best bet, one could argue "that's not scientifically feasible", but these are fictitious aliens from another universe. I'm sure some hand-waving is okay here.
I think a lot of your ideas here are pretty good and well thought out, though naturally things get harder if this second head is as big as the primary one. I don't know the location or orientation of this second head, but if your Troll can take a hit to their ego, then they could grow their hair long and wear an extra large shirt to cover the second head, make it seem like they're a hunchback or something of the sort, perhaps some sob-story about being injured as a child or being a recluse for so long that their posture tanked, or something of the sort. They'd still probably be targeted by the more bloodthirsty trolls out there, but others might leave them alone.
I think an important thing to note here is that nothing "official" will likely come your way at this point in time. this Troll probably isn't going to be tracked down by government-funded mutant cullers or the like, at least according to my own personal headcanons. Personally I believe the Trolls get one look for deformities or horrendous mutations at birth, and then are kind of just left alone until adulthood, at which point they're (probably) taken in regardless of what they have, as they've shown a capability to survive and thrive with it. They might still get some trouble from other adults in a non-official sense though.
For the most part, I think the "they stay in their hive all the time" method will likely work the best. any other method largely depends on the size of the second head combined with it's location and orientation, I'd expect they'd be regulated to a similar position in adulthood if they make it that far, something that can be locked away into a side-room and never looked at, someone who can man the security cameras with twice the processing power to observe and report on the wall of TV's while alerting ship security or the like.
hope this helps! -D.