Do you mean superfluid liquids? There is work that tries to related the degenerate fraction of bosons to superfluidity eg. Bogoliubov, Khalatnikov, Landau, Feynman but beware that the condensed fraction and superfluid fraction are not the same thing.
BE condensates are most well defined for weakly interacting bosons where all the particles fall into the same state, opposite to what happens with electrons and the Pauli filling rule for them where only two can be in the ground state. see Kerson Huang's book on Stat Mech.
Supercooled liquids are a classical phenomenon where ordinary liquids like water can be cooled below their freezing point. Without nucleation centers this can go very far. I think liquid water drops can to to -40 or more without freezing.