However, some playful options could be:
* A "clatch" of haggis - referencing the Scottish "clatch" which can mean a group of people or things.
* A "hirsel" of haggis - "hirsel" is a Scottish word for a flock of sheep, so it might work for a group of haggis.
* A "pudding" of haggis - using the traditional name of the dish.
Ultimately, you can get creative and choose whatever sounds best to you!