|Hey. This is a good story on the first read. You have a good sense of humor. I liked how you gave professor Frostman his peanuts he was always choking on. I want to do a full review on this story because I saw an element in this story that could appeal to anyone. You're at a good starting point, so here is my first impression.
You got a good hook at the beginning. You could do a better introduction of the characters. There were a lot to keep track of. I also didn't have any idea what they looked like. How big were the elves? Do they have crazy skincolors like green, blue or red, or just human skintone? What sort of clothing do they wear? What did professor Frostbite look like?
It would also be good to develop your characters. You mentioned Snowflake is attractive? Does she use it in way, or is it just an advantage? Who is the smartest? The dumbest? What are they good at? Horrible at? Scared of? (For example, if any of them had a terrible fear of snowmen.)
Develop settings as well: How big is Professor Frostbite's throneroom? Castle? Is it filled with ice stalagmites, stalactites, or is there an ice crystal chandelier hanging from the ceiling? How cold is it? Also, I assume Santa's prison is barred, since he could reach through and grab the professor.
You ending is abrupt. You never even mention this Soviet salesman, or I don't remember it. Don't worry if you give your readers enough clues to figure out the ending. It isn't very fun when it comes out of nowhere. Besides, most of your readers will not be sure of the ending, so long as you don't give absolute evidence.
Then, what happens to Professor Frostbite? The last we hear of him is ordering the snowmen to surrender.
Tense, (I know, I have trouble with this too,) just watch out for it. Example: The members of ET6 looked around at each other, stunned. The words no elf wants to hear. Protocol Kringle. Santa has been kidnapped.
You go from "the members of ET6 looked" to "Santa has."
Add Details: Example: They snapped to, and began gathering equipment. What equipment? What does the equipment look like? sound like? Smell like?
What caught my eye about this was - it would make a good children's, YA, or adult book, whoever you decided to target. The real potential of targeting a children's audience is that you've got the wit to entertain an adult reader as well. If you find yourself thinking: children are stupid, they really aren't. If you just substituted a few of the swearwords in this piece you could entertain them well. If writing for children doesn't appeal to you, write for adults. It would entertain them just as well, and we all need a laugh once in a while. (And I'm definitely not good at being witty.)
Thank you for the read, and keep in mind, this is advice. If any of my suggestions appeal, seem to fit with your story, use them. If they don't, then don't use them.