Can u update the plugin to fully support latest 1.11.2 items ? when i do /itemdb with the polarbear egg it says me only 383:0 but it isn't, do i need to update something ?

Spawn eggs are known to have issues. Other 1.11 and 1.11.1 items have already been added and 1.11.2 didn't add any items.

so what do we need to do to have updated monster eggs id ?

The way items work was changed in 1.13, and item db has had substantial updates since then. Please download the latest version and create a new issue if you still have problems spawning items.