I tried my own character based on depictions of trolls in early editions of D&D. Unfortunately, this character had complete hands, and by the time I was done I realized why @Grant_Abbitt used a character with clinched fists instead. Remesh removes the space between the fingers and decimate creates non-animatable topology, leaving manual retopology as the only option that would be likely to work.
I’ll probably re-do the second half following direction more closely and with the intended character someday, and perhaps re-do the troll using a different technique (more low poly modelling with multiresolution for details) on my own in the future.
EDIT: I went back and now I have finished the Ogre (the troll will be for some other time):