Tidally locking happens to all orbiting bodies. It is only a matter of time. Once tidally locked, they stay that way, unless acted upon by an outside source.
Differences in mass and distance affect the time tidally locking takes to occur. Our moon is tidally locked with the Earth. that took some time, and it also slowed the earth's rotation down by a factor of 4. Earth's 'days' used to be about 6 hours long.
But the distance between the earth and the moon has also increased and continues to do so.
Moons around Gas giants have a much smaller mass ratio and tend to be 'closer' so are going to generally tidally lock much 'faster' than it took for the earth and our moon.
However, the one main outlier are liquid moons. Moons that are primarily liquid in the center (or have a very large liquid layer) tend to NOT (won't?) tidally lock such as Europa.
And that was one of the main clues that it had a lot of liquid, since it SHOULD have been tidally locked to Jupiter.
It appears there might be some dispute on Europa's tidally locked status. But I think a more scientific paper needs to be found to support the 'not tidally locked'. This was from Wiki.
...Like its fellow Galilean satellites, Europa is tidally locked to Jupiter, with one hemisphere of Europa constantly facing Jupiter... ...Research suggests the tidal locking may not be full, as a non-synchronous rotation has been proposed: Europa spins faster than it orbits, or at least did so in the past. This suggests an asymmetry in internal mass distribution and that a layer of subsurface liquid separates the icy crust from the rocky interior.
They used to think that Mercury was tidally locked with the sun, but it has been discovered that it rotates at a ratio of 2/3 it has a ~58.5 day long day (Earth Days) and 88 day (Earth Days) long year. And according to JDługosz this is a stable type orbit so it is possible that some moons in an eccentric orbit might stabilize in this pattern, as a 3rd option.