There are several different Python projects called “snappy”. I don’t think you can install the ESA SNAP snappy using pip, so you likely got some unexpected “snappy”.
If you are familiar with ESA SNAP, you already know ESA SNAP snappy requires an installation of ESA SNAP, which is a Java application. When you install SNAP you can ask to have snappy configured and supply the path to the python interpreter you want to use. “jpy” is a bidirectional interface between Java and Python. SNAP provides prebuilt Python wheels for various platforms and Python versions.
There has been interest in a “headless” command-line installation – maybe someone else has that working by now.
Colab FAQ says"Users with high computational needs may be interested in using Colab’s UI with a local runtime running on their own hardware."