Size difference?

[RoreyRoreyRorey]

At what size would it be safe to put my two other African Clawed frogs in with Froggo? Froggo is 5+ inches long, and the two others are about 2-3 inches at most. But at night I’ve been hearing Froggo calling, and I’ve heard the little ones clicking back in response. The picture is comparing Froggo to Shadow.

 

[RoreyRoreyRorey]

Apparently I worried for nothing! I did a trial run of them together under close observation and they seem to get along fine. Maybe a little too fine. They started amplexus immediately haha