Do their tails have a white edge? In the first pic, it looks like they might, but I can't tell in the second pic with the white wall behind them. If it's edged in white, they're likely spotted. LMB have a clear/yellowish tail fading to black, so bicolored. In spotted bass (as well as SMB-which these definitely aren't, and maybe some others) it goes from the clear/yellowish to black then to white at the edge-so tricolored. It's usually more apparent when they are young, and one of the easiest ways to tell small spotted or LMB apart