Once upon a time, I came across a brilliant dingbat "alphabet"--all images of what I'd describe as creatures, critters, or monsters.
Examples of vaguely similar monsters:
- Nibbler on Futurama
- The vermicious knids from Charlie and the Great Glass Elevator.
- The "Infiltration" monsters shown on this deviantART page.
Most notably I remember a cute one-eyed squid that I incorporated into my sigblock. But that was 10 years and 3 companies ago and any details beyond that are lost.