I always feed my guys separately, in a separate container. This way I can monitor their eating and make sure the more greedy toads don't get all the food. My guys are used to this, so it doesn't seem to stress them at all.

My experience with Woodhouse's toads suggests that early size differences don't always carry through to adulthood and don't reflect the gender of the toad. My smallest toadlet is now my largest toad. She just had her growth spurt later than the others. All of my toads have hit a major growth spurt at some point in their development, some early and some late, and it is this growth period that really determines their final size. I don't have a huge sample size to go from, but anecdotally, it seems that the males have their growth spurt earlier and mature (reach more or less mature size) considerably earlier than the females. I believe the early maturation of males is borne out by field studies (on this species).