Keynote - need individual letter graphics that can be moved/manipulated to create words on slide I teach kids who failed to learn to read in school, online. I am making a series of presentations for very simple words like "is," etc. 

I need to have some large alphabetic letters at the top of the screen that I can make bounce, slide down into place, and so on. I think they would be called graphics, but I don't know what phrase to use to search for on the web to locate some sets in various fonts. I found individual letter .jpgs/pics, but they all seem to have too much space on the sides to put them close enough for words. 

I tried making my own by taking screenshots of each letter, but lots of them keep having a thin grey line show up on the pic. No clue how to stop the thin grey lines, but I know they'd interfere with my struggling kids' learning.,  

I'm a graphics nincompoop, and know nothing. Any ideas or suggestions would be infinitely appreciated.
Could you not just use text objects in Keynote to do what you want? Create a text object with the letter A, resize and colour it etc, create another text object with B, etc.