Gees. Chub-chub go nuts with crawlers. I just put him and the crawlers in a small tupperware container and he eats like you wouldnt believe. No wiggling needed.
My students love watching that. Especially when the worms can be seen squirming in his gut, or when most of the worm has been swallowed except for the very end which hangs out his mouth and makes him look like Jabba the Hutt. Yeah, my kids are nuts.