yes but one that had an electric fan so it required a power source. Tried with a unit that had no fan and the heat just doesn't radiate well without a fan.
My experiments were in a greenhouse but will be the same experience in a tent.
here is a Candelier that can boil water or cook in a metal cup or bowl on top but needs to be sitting very stable.
This unit claims to also throw a lot of heat but I don't have the box and detail sheet in front of me to say how many bTU's it throws. It uses 3 if the long burn emergency candles and in the tubes the candle go into , from the bottom, there are individual springs in each one that keep the candles at the top of the tubes.
Not very effective but they are a handy source of light with a side benefit of heating up a can of food or boiling water for a cup of coffee or tea.
It stays in my shtf emergency bin with 12 x6packs of candles
Then there is the Buddy heater. There are several types but in a tent or camper type area would highly recommend this one right here.
Runs on a 1lbs propane bottle or using an extension hose (they recommend their brand with a filter) and I have a 6ft.
Works well for having the tank outside and the heater in the tent.
MD.... this is the one you should get right here. Has an auto shut off valve if it senses to much bad fumes in the air.
and if you get craft with some sheet metal you can make a base that sits on top of the heater with one of these heat activated fans. Moves the heat around a 6x6 x6 ice hut in -20's no problem. I have a base here somewhere but not hand for pics.
but here is the fan and these are availlable in several styles on amazon