To get the final trap frame, make sure you have NO other toontasks in progress. Make sure you completed all Laff+ tasks, jellybean bank+, teleport access, gag pouch+, and all OTHER frame tasks are completed, and last but not least, NO Just For Fun tasks. This happened to me, but I knew what to do. :)
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There actually is a 16th gag track. I just happened upon it in my own toontown account. However, it says you have to become a member in order to do it. I found that you just have to go to the npc and get the task(its a very long but easy task).
When you've finished all required tasks on a playground, including the first 15 gag track tasks, you'll be given a final task (actually, a series of tasks) to do. Finishing that gives you your gag track.
you dont have to be a member you can get the last tasks on either toon up drop sound lure ect. you got to professer pete and he will let you do the task but the last training task is always the hardest so good luck. :)
probably the vacum lure gag
You can't trade gag tracks.