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There is a saying in the Netherlands, "Krakend ijs breekt niet". Which translates to something like "Ice that makes cracking sounds does not break".

When looking it up online, I found several news sources re-iterating it. But I could not find why or how.

The reverse is also said to be true: when ice does not make any sounds, it is not safe to walk on it.

Does this piece of folk wisdom have any merit?

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    This recent video of someone skating on a canal in Amsterdam certainly disproves the theory that ice which makes a noise is safe. For those who don't want to click in the video the ice is clearly heard making cracking sounds right before it breaks and the skater plunges in to the water. twitter.com/i/status/1360997258163027976 – Eric Nolan Feb 16 at 11:15
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All the sources for the saying that I came across contain additional statements which limit to which cases this wisdom can be applied. For example:

Overigens moet je hier wel mee oppassen en zijn er twee verschillende soorten kraken van elkaar te onderscheiden. Lange doffe kraken betekent sterk ijs, maak je geen zorgen. Korte felle kraken en breekgeluiden betekent het ijs is aan het breken, houd snelheid zodat je niet stil komt te staan op het ijs en rijd zo snel mogelijk naar de kant

By the way, you have to be careful with this and two different types of squatting can be distinguished from each other. Long dull crack means strong ice, don't worry. Short fierce cracking and breaking noises means the ice is breaking, keep speed so that you do not come to a standstill on the ice and drive to the side as quickly as possible

Another observation is that weak ice tends to break without a warning, so if you get to hear the cracking without instantly going for a dive, you're likely on safe ice.

Note that serious advice about safety of ice doesn't mention cracking at all, instead relying on actual thickness and visible features (color and transparency).

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