What if Dumbos could have the ability to mimic the sound of killing/eating without actually affecting anyone? Killing would sound like the death of whatever animal the Dumbo is since Dumbo is the one who mimics. So, if someone gets fooled by it and isn't focused, they'll try to vote for Dumbo even if nobody died or Dumbo mimicked Carnivore with no Carnivore in the game. Just to throw players off and have fun as Dumbo
How I think Dumbos could play with this:
Mimic a death noise while near/holding a body that nobody has found yet
Mimic an eating noise near someone
Mimic a death noise with no body and laugh at those that voted for you
Mimic an eating noise with no Carnivore and laugh at those that voted for you
Just make noise for fun
If this is something that strays too far from Dumbo's core role, maybe it could be called a Jester role or something.