There isn't an embedded poll facility on Freegle Direct, but that doesn't stop you having a poll if you wish to.
Polls are sometimes run if there is an issue that the volunteer team would like the opinion of their members. Examples could be how often a message should be re-posted, should there be a restriction on frequency of request posts, or should live creatures be allowed to be offered and/or requested etc.
There are a range of free online poll facilities you can use, the simplest probably being Doodle. It is free to use, it is simple to set up and can be accessed at https://doodle.com/free-voting-software . Just register, set up a poll and send the link out to your members.