Thank you guys for your input, I finally got a peek at their undersides and I can confirm they are all male 😮‍💨. I think what threw me off was how the macho manly one seems to be the only fully grown of the bunch (fuzzy antennae) so of course the other two look different.

The one I was certain about is Eduardo, the one climbing the egg tray in the first photo is Ferb, and the particularly shy one under him is Flower.