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Personally, I believe the difficult terrain is not forcing us to make the save; the two effects of Aberrant Ground are separate, neither relies upon the other. The creature makes nearby terrain difficult and forces nearby creatures to make a saving throw. Additionally, nothing says that the terrain itself is forcing us to make the saving throw. This also prevents the odd scenario of having full movement but zero speed.

Personally, I believe the difficult terrain is not forcing us to make the save; the two effects of Aberrant Ground are separate, neither relies upon the other. The creature makes nearby terrain difficult and forces nearby creatures to make a saving throw. Additionally, nothing says that the terrain itself is forcing us to make the saving throw. This also prevents the odd scenario of having full movement but zero speed. And finally the two effects of Aberrant Ground occur at different times, difficult terrain is always difficult, but our speed can only be reduced at the start of our turn. This leads me to believe the effects are entirely separate and that the difficult terrain is not what causes us to make the saving throw.

1. Ground within a 10-foot radius becomes difficult terrain.

2. If a creature starts its turn within a 10-foot radius, it must make a saving throw; failing this saving throw makes their speed become 0.

1. Ground within a 10-foot radius becomes difficult terrain.

2. If a creature starts its turn in that area (a 10-foot radius), it must make a saving throw; failing this saving throw makes their speed become 0.

The freedom of movement spell only prevents difficult terrain from affecting our movement. The saving throw happens regardless. The effects of failing the save are somewhat ambiguous

In the end, we will make the save no matter what as making a save has no effect on our movement and freedom of movement only prevents difficult terrain from affecting our movement, nothing else. That said, what happens when we fail the saving throw depends on whether a GM believes it is the difficult terrain or the Gibbering Mouther that caused us to make the save.

Personally, I believe the difficult terrain is not forcing us to make the save; the two effects of Aberrant Ground are separate, neither relies upon the other. The creature makes nearby terrain difficult and forces nearby creatures to make a saving throw. Nothing says that the terrain itself is forcing us to make the saving throw. Therefore freedom of movement cannot help us here.

The freedom of movement spell only prevents difficult terrain from affecting our movement. The saving throw happens regardless. The effects of failing the save depend on whether you think the terrain is what forces us to make the save in the first place

In the end, we will make the save no matter what as making a save has no effect on our movement and freedom of movement only prevents difficult terrain from affecting our movement, nothing else. That said, what happens when we fail the saving throw depends on whether a GM believes the difficult terrain is what caused us to make the save.

Personally, I believe the difficult terrain is not forcing us to make the save; the two effects of Aberrant Ground are separate, neither relies upon the other. The creature makes nearby terrain difficult and forces nearby creatures to make a saving throw. Additionally, nothing says that the terrain itself is forcing us to make the saving throw. This also prevents the odd scenario of having full movement but zero speed.