There were services like ACN (American Comedy Network) which used to provide clips, comedy bits, song parodies, fake commercials, interactive "callers" which were scripted bits for the host to banter back and forth with a "live caller" and similar that they labeled "Daily Show Prep Content". One station I was at used their stuff pretty heavily for the morning show when they had just a single morning jock and that ACN content did generate buzz among listeners and added a lot of comedic value to his show. Once they transitioned to a "morning team", they used ACN less and less until they stopped subscribing to it. If I recall, a record rep later wanted the PD to give heavier airplay to a few crappy artists, so in exchange the PD had the record label buy them the "ACN Gold" library which was supposed to be somewhat timeless bits that wouldn't age for a while, that they could toss into their show whenever they felt the need.
I saw several years back that ACN folded, and some of their staff later created "Universal Comedy Network" and it served a similar purpose. No idea if they're still around.