Once something is bent, it is never as strong as it was originally. Depending on where and how badly the bend is and the tongue weight involved, it may or may not be an issue. I suspect the bend is due to turning too short and the bumper of the tow vehicle did the deed.
Bent tongues and couplers are often caused by backing into something.
A curb, a tree stump, a well head hidden in long grass, ask me how I know. :facepalm: :facepalm:
If a minor slight bend, probably ok.
If it is kinked, or damaged, or you have a trailer large enough to have brakes, you might want to get it fixed.
Is the tongue integral to the trailer or is it a separate piece of tube? You can buy a piece of tubing from a metal supplier, bolt on/weld on a new coupler and bolt the new piece onto the trailer. Been there, done that. If it is welded to the trailer a trip to a shop will be needed unless you can do that yourself as well.