Not sure about Regeneration cos Trolls havnt shown that to my knowladge, unless I missed something?
I don't know about Tinkerers interpretation, but regeneration is pretty much cannon for all Trolls I've encountered across Games/Books.
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•Giant Spider: boost in Speed & Attack chance with Poison % on attacks. But less DMG.
Outside of battle MC could turn into a Bird tro shorten travel time between maps.
I'm not awake enough right now to brainstorm specific creatures, but if Tinkerer implements something like this, doing it in levels might be best
for example Boars/Bears/Trolls might all be examples of Tanks, Boars = lvl1 tanks, costing 1x energy per turn, Bears = Lvl2 tanks costing 2x Energy per turn, Trolls = lvl3 tanks costing 3x Energy per turn.
Other creatures might be tabled by special ability (like poison)...
GatorBeasts would be a cool creature, I imagine they should have high resistance to most things plus their natural armor