How to Doodle Tongue on Trumpet 

I find doodle tonguing much easier for articulating linear phrases quickly, and single, double, or even triple tonguing easier for clearly articulating wider intervals. I will sometimes practice doodle tonguing lines using fourths and fifths, but in real world scenarios I feel best freely switching between various approaches to tonguing based on what is required in the moment. The trouble is the "dle" of the doodle will never be as clear as a single tongue because of the mechanisms involved, and sometimes you want a very clear articulation when you're moving across wider intervals. I'm a big fan of improvising with wider intervals on trumpet, and the king of intervals was Woody Shaw. From what I can hear and have heard from trumpeters who knew him was that he was more likely to use double or triple tonguing than doodle tonguing. It's probably worth practicing doodle tonguing wider intervals for the practice, but you may find more facility just switching between approaches depending on the situation of the moment.

That was exactly the problem I was having, and I made this video once I had found a way to get a clearer articulation with the "dle" half of the doodle tongue. Hope it helps!