No. Troll illusion specifically gets regen; illusion regen doesn't give bonus regen.
Neither do you get the race skills of the race you turn into; you don't get hide and sneak for example if you turn into a Halfling. That said, if you appear to be a troll, ogre or barbarian you will be able to slam (and the reverse is true, if you don't appear to be one of these races you cannot slam).
I hope this clarification was useful!
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