Inspired by If a corpse is polymorphed into a creature, does it retain personality?
True Polymorph can turn a creature into an object
Creature into Object. If you turn a creature into an object, it transforms along with whatever it is wearing and carrying into that form. The creature's statistics become those of the object, and the creature has no memory of time spent in this form, after the spell ends and it returns to its normal form.
Since a corpse is an object, a creature can be True Polymorphed into a corpse.
Can it then be raised, by a spell such as revivify or true resurrection?
Best Answer
No.
Let's check the spell descriptions and find out why not.
True Resurrection:
Since the polymorphed creature is not dead, it cannot be resurrected using true resurrection.
Revivify:
Since our polymorphed creature has not died in the last minute, they cannot be revivified.
Raise Dead:
Since the polymorphed creature is not dead, they cannot be brought back using Raise Dead.
Since spells only do what they say they do, I do not think true polymporph can be combined with any of the above spells.