Atra du evarinya ono varda.
Yes, it is possible. After it hits the level required for Krokorok to evolve into Krookodile which is level 40, it will keep on attempting to evolve every time it gains a level unless you temporarily stop its evolution by pressing the B button.
For example, it will attempt to evolve at level 41, 42, 43,......all the way up to whatever level you want it to finally evolve.
Hope this helps! :)