You can search for Bitmoji stickers,if you have already created your Bitmoji in Snapchat. Below are the STEPS to do it:-
1. Open Snapchat.
2. Click a photograph and click on the screen to activate the tying mode.
3. Now long-press on the globe sign and select Bitmoji from there.
4. Click on the ‘Search Bitmoji’ and search for whatever you would want, and then select the sticker of your choice and place or re-size it as you may want.