Culture Shock

There are several things that the term "culture shock" might describe.

If you're looking for a trope, there's several it could be:

Values Dissonance is when a work shocks the reader due to cultural differences.

Culture Clash, when foreign cultures conflict with one another.

Fish out of Water is the plot structure trope about a character having to deal with culture shock.

Fish Out of Temporal Water is the same as above, but with time travel.

If you're looking for the webcomic, that's over at Culture Shock.