Identifying worms

[jjjoachim]

Hi!

Just got my first garter snake last week. T. sirtalis parietalis. He's a healthy, handsome guy, if a bit skittish still, and I absolutely adore him. So far I've tried feeding him salmon, but with no luck. He shows a bit of a feeding response, but then backs off. I have these worms that I purchased several months ago that I've been meaning to feed him, but I'm unable to identify them to know if they are safe or not. They're alive and well in a container in my fridge. They were bought at a reptile show, I've asked the seller but haven't received any answers.

Would any of you have any idea if these are safe or not?

Thanks a lot!