If you prefer offline use, verified font files exist, but they require more caution. The safest method:
Visit a reputable site like OnlineWebFonts or Donut Team to find the .ttf or .otf files. Install: oggy and the cockroaches font generator verified
If you want, I can:
, though these may require a purchase for the full commercial version. Are you looking to use this for a YouTube thumbnail birthday invitation , or perhaps a Oggy and the Cockroaches Font Generator — Verified