I'm not 100% sure from your pics but there are several ways to tell the difference between male and female toads. Males are more muscular with rougher backs and pointed heads, whereas female frogs are rounder/plumper with more blunt heads. If one or both of your frogs has been calling then that one is definitely a male. Any frogs who try to grab other frogs from behind with their forearms are definitely males. If your frog makes a sound when another frog does this to them, then he is also male. Hope this helps!