The way it is presented to the player is in the form of 4 cards Freeze|Congeal (common) and Arctic Squid|Arctic Octopus (rare)
The Rare card references the effect of the Common spell card by name.
That still means there are two different names for the same ability. We agree that there are two different names, I'd like to argue that it's not a good thing.
It isn't immediately clear that the spell shockwave also refers to the congeal effect too.
Both freeze and congeal mean to solidify something. The means by which they do it are different.
A shock-wave would not shatter a liquid or gelatinous body.
A shock-wave might shatter a solid body.
Freeze means to solidify. Congeal means to remove the liquid from an emulsion.
A shock-wave of said liquid could shatter a liquid at the molecular level if it traveled at the liquid's natural frequency.
They are not the same thing.