This thread really got me thinking so I googled it for myself (I love to use Lameboy myself), and as far as I know, no, there are no cheats on Lameboy. :::::::
If you want to temporarily use cheats for certain parts of the game, you can click and drag the .sav files of your games and play them with the cheats on through VisualBoy Advance. After you're done, just click and drag the new .sav file back onto your microsd.