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No. At this age you cannot tell gender based on size, width of bill, etc. They can grow at different rates depending on how much they individually eat as well as genetics

Can you get a clearer picture of them? Looks like (from left to right) blue based tricolor, black based tricolor in back, black in front, and a chocolate on far right

The heavily marked ones are tricolors. Do you have pictures of the other two? You won't be able to sex them by voice until they are 8-10 weeks old