Will phoenix worms grow in original container?

I ordered 200 large phoenix worms from a different site than I had b4.... And now I know why they were cheaper. They're NOT large worms. They might be medium but they're definitely not the right size.
So my question is, will they grow a little bit if I just leave them as they came for a week or two?
I read how to grow them yourself but I really don't want to go through all of that since I just embarked on the world of dubia breeding.
I have a small ventilated container I can put them in, and I have a banana and some carrots I can mash for them to burrow into if that's the only way to get them to grow.. But it'd be cheaper to throw them out than to go buy the heating pad, baby food, and bread. Bc I'm not buying anymore as soon as my newborn dubias are big enough to feed my dragon.

Soldier fly larvae are eager composters. They eat just about anything (including poop), but veggi/food/fruit scraps will be best considering the application. I'd try just giving them some of your dragons' greens, or the bannana and carrot. You can google black soldier fly composting - I'm not exactly sure how to prepair food (or if you even need too), you might just be able to chop it up and put it in with them.