If you had a wild caught frog then yeah go ahead and feed it to your frog. Captive born i wouldn't. like mentioned in other posts freezing does not get rid of everything. Wild caught frogs such as American bullfrogs have a built up immune system that can coupe with whatever is passed to your frog from the wild caught prey. Captive born frogs do not have this immune system. Now if you are not new to keeping frogs and are aware of the dangers of feeding wild caught prey and know where to catch your prey and where not to, then i would say go for it. I feed my toads pill bugs that i catch out and way from populated areas because i know that those area's are pesticide free. And also my toads Are WC. Even store bought live foods can contain parasites. there is no escaping it. There are articles on this forum on how to deal with them. Just be prepared for that and keep a first aid kit so to speak on hand. Most pet born illnesses are from poor husbandry anyways. Take advice provided by members on here they do have good knowledge to share. But don't count wild caught prey completely out either.