I install the poll plugin using Essentials and then use the new content blocks configuration UI (to be released soon). That UI provides me with e a way to choose from the available compound types. The Poll plugin installs a compound type called "Poll component". To me as a developer, this looks like a HST component is showing up in the wrong spot. I suggest to rename the translation(s) of this compound to something that suggests it's a compound or grouping of fields.