Stickers have just found their way to the Telegram, and if you have already added sticker packages to your Telegram collection, do as follows to send a sticker on Telegram for Android:
1. Open the Telegram application on your Android device
2. Open the chat/group you want to send a sticker to
3. Tap the Smile icon on the bottom left
4. Now, on the list of available stickers and emoji, tap the sticker icon ( )
5. Here you can find your entire stickers collection, and you just need to tap a sticker to send it to your firend
See Also: Learn How to Add Stickers to Telegram on Android.