Lija's suggestions are good. You could use a pre-killed rodent to feed before you leave, or buy one and pre kill it yourself. There are Canadian night crawlers from walmart that are unscented and a lot of us have used them successfully. Your caretakers using a net to scoop out dead crickets is a good idea as well. That being said, your frog easily can go (as you have observed) more than 10 days without food and be fine.