What circuit is it connected to? Is it an oscillator, a power supply, a protocol interface/level shifter? This will give us a clue of what it is for. Search different combinations of the lines, sometimes the IC code ocuppy two lines.
As it's a toy, it might be manufactured in china, and sometimes specific ICs used in this devices cannot be found so easily. Something I usually do is replacing the starting letters of the code, for example, an IC I used was TP4056, and when I search for it I find a LT4056 (from Linear Technologies) that does the same function... manufacturers will change these leters and probably more if they are chinese.
Hope being useful