That's right - check-boxes are available in Sheets.
When you are in a sheet simply select
Checkboxes in sheets have many uses - the one I show below deals with my wife who teachers 4th grade and has students write a state report. Students can not double up, so pasting in all 50 states and then adding checkboxes in the 2nd column easily shows what states have and have not been chosen.
FYI - this new feature was available in my personal Google account and has not yet been added to my school account.
Embedded below is a 31 second YouTube tutorial.