You can't remember any specific instances because there aren't any. If Trollocs are not exlcusively male (as their very nature suggests), then they have no true gender. Aginor created them in the War of Power by some esoteric form of genetic manipulation that allowed him to marry human and animal features, probably using the One Power (or else some Age of Legends black science). We never see how Trollocs are created in the current age -- which suggests that breeding may be possible -- but we also never see any trolloc young. For all we know, Trollocs are spun into the pattern via the Dark One or else "hatched" in some strange ter'angreal that exists in Shayol Ghul.

Fades are the throwbacks of Trollocs and Humans, so that doesn't really provide us with any substantial evidence of female trollocs, either. I can't rightly say that there are no female trollocs, but I can say that we have not seen any evidence to indicate that there are. The lack of Trolloc young is another strong indication, IMHO that they are more likely created than birthed. Unfortunately, there isn't any evidence that lends weight to either side of the argument.