No, its not a good idea...thats why they call it POPular. It pops when it is burning.
Put the spark screen up and you'll be all set to burn poplar. It will burn faster than other hard wood, and not quite as hot, but it is definitely ok to use...
It will burn, its not the greatest, and it is a little stinky if you
have it sitting inside. It burns quick not a lot of heat output,and a
lot of ash. But free is free.