Boolean Functions Implemented by Multiplexers
I think there is no specific name for it, just several methods, c.p. this website
Note that it's quite simple to e.g. implement all 2-input logic functions with a 4 input 
 1 output mux, by connecting the inputs to the address/select lines, and applying the constants 0/1 to the data inputs. (This actually transforms the MUX into a Lookup table (LUT))