Can you? Yes. Should you? No
You may be able to allow supervised interaction during free roaming when they are not in season.
I have seen on many forums where iguanas housed together ended up in tradegy. Some were baby/baby. Some adult/baby. Some were male/female. Some were female/female. Some were housed together for just a few days some for many many years with no incident and then the owners came home to a blood enclosure with one or both iguanas severely injured or dead. Any iguana--male, female and babies--can be territorial or dominant.
Yes iguanas can/do get a long. But the problem is that in an enclosure there is not escape when there is discord that turns into violence. Even with humans the best of friends argue/fight and that can even end up being physical. But with us one can walk away. Same with human kids and couples. Us humans who are civilized don't even always get along. How can wild animals be expected to.
And it is not just actual violence that can be the problem. The dominant iguana will intimidate the subordinate to not eat or bask. We may not even see any signs. They have a language of their own. The subordinate may eat and bask but not get the best food or best basking spot. It may just not grow as fast and be more susceptible to illness. Also just having two iguanas in the same house has these type of problems.
So I strongly recommend you just spoil the iguana you have now. More is not better.
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Marie
Poyner Corner