Hello ytt!
Sure, let me answer!
1)You are free to rename creatures as your project requires!
2)Thats a good place to do so, as mentioned in the terms of use!
3)Subbing to patreon will let you access the most up to date library, currently clocking at almost 1.2k designs now!
https://aekashics.itch.io/librarium-batch-libraries
Thanks for your interest