The card Bigtwig from Untamed allows you to stun and exhaust a creature. Would this mean the card that is stunned could not unstun on the next turn because it is already exhausted? I feel like that is correct, but I would like to confirm it. Thanks!

Yes, they have to spend one turn unexhausting them, and another unstunning them.

that's correct, the next turn of that player they will have a stunned and exhausted creature, which must be "readied" through other means. at the end of their turn, all exhausted cards are readied.

Thank you for the replies!