ID help: Brown Wriggly Thing in with Crickets

[UncleChester]

Hello. A few of these critters (see attached photos) came with my crickets. This was the largest one I could locate, and is about 12-13mm long. It can climb plastic, but not shiny packing tape. It is also quite fast (I cruelly chilled it for the pictures). The cricket breeding facility is in southern Ontario if it helps ID. I was wondering:

What is it?
Can I feed it to Gray Tree Frogs?
If so, can it be cultured easily?
Can I leave them in with the crickets?
Does it turn into anything?

If I knew what it was, I could probably sort out the rest, but I don't know insects very well. Thanks in advance for any assistance!