If you've not tried Badugi (at PokerStars), you're missing a good tool for improving you betting techniques. The variables in play are challenging to comprehend; yet one can improve their chances at applying pressure on the other players at the table by giving the impression one has Badugi and yet may only have 3-card hand. Try it; 'tis challenging.
I wouldn't try this too early in the tournament, especially in a freeroll, where nobody folds. It also helps to gain some credibility having a few 4-card badugi hand showdowns under your belt before attempting this
bluff. Also, I'd only do this from mid to late position where 1) your opponents have drawn at least 2 cards and 2) if 1 opponent has drawn just 1 card, he is in front of you, and checked to you.
Not sure this is considered good strategy, (it probably is, and this goes for any position) ...but if dealt a 3 card all-low hand, I like a min - 1/2 pot raise. Just how much depends on how many in the hand, position, how many cards they are drawing, reads on playing style, etc. The obvious purpose is building a pot when you hit. But you also want to make a pot sized bet uncallable should a good
bluffing opportunity arise after the 2nd or 3rd draw. I would never bluff pre-flop or even after the 1st draw. Drawing the 1 card and hitting is more believable than being dealt a 4 card Badugi that is lower than what your opponents may be drawing to.