Because I was confused as to why you would give a pinky to a constipated frog...? I wouldn't be offering "treats" at this point but concentrating on a diet that will be conducive to getting some normal bowel movements from your frogs, without inducing prolapse as a possible side effect when they are able to go. The poop you just saw would have been the previous meal(s) as pushed through by the bulk of the baby mouse; I would keep a close eye on your frogs...
JFYI, this is what a prolapse looks like...
This is why I will not feed my guy pinkies, or crickets, or anything else I deem digestively sensitive material. Right now he is getting earthworms interchanged with waxworms, and I hope to obtain some small hornworms when I have a cooler to keep them in at temps that will slow down their growth (hornworms can reach 4" in short order).