It is ALMOST impossible to tell when their that young, however, I have seen quite a few Sambava babies and your lil dude is definitely displaying some similar markings. We shall see!!!
Haha they do get big FAST! To slow their growth down you need to chill them out. The fridge is too cold, but if you grab a cooler put some eyes in a big bag on one side, make a decvider wall with cardboard and place the worms on the other side... Depending on how little your cham is the moths...