HealthyCanning is an excellent resource for safe canning recipes. They have several green tomato recipes here: https://www.healthycanning.com/tag/green-tomatoes

Given these are cherry tomatoes, I’d especially recommend this recipe: https://www.healthycanning.com/pickled-green-tomatoes

I’ve also found that salsa freezes surprisingly well in wide mouth mason jars.

Finally, if you let them sit out, many (most? all?) of your green tomatoes will eventually turn red.