May as well prime with some coconut sugar.Its very available,usually in healthmarket sections of grocery stores or whole foods, it has a pretty carmally unique nutty brown sugar taste to it. Or Just get it to bake with, its really good. Made some fantastic chocolate out of it as well as everything else it made awesome.
The bubbles and airlock is probably just some off gassing from the disruption of suspended co2.
Im with the others about the dry coconut it may have a bit of sugars but probably not enough to make much of a difference.From it being toasted that is carmalization and thus you have unfermentables also at least that is the theory of carmalization,so it makes sense to me that there wouldnt be much sugars.I think it may kill alot of any head,but could be wrong about that,possibly because maybe toasting rids the oils/fats.