I was looking around online and it says that a male husky should be about 23 pounds at 12weeks. I got Mako weighed at 11 weeks at the vet and he was only 15 pounds. Is that normal weight? He did get worms sometime between 6 and 11wks, could that have something to do with his low weight? Ever since he got dewormed he's been eating less. Also, about how tall should he be at 12wks? I feel like he hasn't grown that much taller, just longer.

Cheyenne....puppies come in all sizes and shapes, as long as he is healthy and eats, I wouldn't focus on his size right now. There is a thread here, that may help you, everyone posts up height and weight of their pups/dogs, and you will notice Mako is pretty normal. here is the thread....
https://www.itsahuskything.com/t13214-weigh-in?highlight=weigh+in

It is kinda long, but we also have a locked thread, same title that is 40 pages long, happy reading, and hopefully that will put your mind at ease.