Fontific allows you to use Google Fonts on your WordPress website.
New fonts added to Google Font Library are not automatically added to plugin font list. But there is a way to manually add new font you want to use immediately. To do this:
1) Create "fonts.txt" file in plugin root directory(where fontific.php is)
2) Copy font names from Google font directory(ex. Swanky and Moo Moo)
3) Add new font names to fonts.txt — each font on a separate line