A good way to get fire away from your teammates is to use some niche Warframe skills.
- Excalibur's Radial Blind makes enemies blind and open for finisher attacks
- Loki's Radial Disarm makes enemies drop their weapons (and, in so, decrease their lethality)
- Ash's Smoke Bomb renders him invisible and makes enemies stagger
- Rhino's Stomp makes enemies take damage and float midair for a considerable duration (great to revive other frames!)
- Nyx's Mind Control and Chaos make enemies divert their fire to mind controlled enemies
And so on.
If you are willing to draw attention TO YOURSELF (as a taunt), there isn't any specific Warframe skill that does that (aside, maybe, from Loki's Decoy, but he's not a tank! and that isn't really effective!).
You can either jump headfirst into a fight making noise (enemies will fire at you with high priority) or be equipped with a Djinn sentinel which DOES have a draw fire ability! The only drawback is that you can't directly command it, the attraction radius isn't that wide and you might have your sentinel burst into pieces from enemy fire! (Djinn is also absolutely expensive to make!!)
I recommend experimenting with the options offered and generate your own tactics for saving your teammates!
Anyone can be trigger happy ninja, but only some can become the Gods of Life and Death themselves ^^ haha.