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I also usually had success with signs when the child was otherwise too emotional to verbalize their desire. They're really upset and crying hard so it is hard to talk especially when talking clearly is already a challenge, but signing "milk" or "eat" or "hurt" or "more" can come through easily.

Wow I had not considered this at all. We used a bit of sign language before my toddler started talking, but have more recently run into these situations where big feelings are crowding out speech and it’d be useful to get anything through. I’ll give this a shot tomorrow

Yeah, a handful of signs is useful for adults in many situations where voice comms don't work. And, at least in my circles, there's a small shared vocabulary of signs that there's a good chance will work. Potty, ouch, sleep, eat, maybe a couple more.

Tread carefully: the sign for poop looks close enough to a crude gesture (cruder than just shouting "poop" at a playground, as it turns out) that an ignorant bystander might take it significantly wrongly.