Grumpy-wumpkins

One who is grumpy for no good reason.

Adelia insisted on being a grumpy-wumpkins for a good two hours after the finish of the boardgame she'd lost, though several well brewed cups of tea eventually put her in good spirits again

Wee Willykins then kissed and hugged the hoppity pot and promised always to help the dollies and never to be an old grumpy-wumpkins again