Steps to follow
Deleting the stickers app is possible following the next steps
Goto the message app
Start the messages app and start a conversation. At the bottom you see icons of the available sticker packs you have installed. Swipe to the left until you see the three dots. Press the dots to present a list of the sticker apps you have installed.
Find the stickers app
Scroll down and find the stickers app you want to delete.
Delete the stickers app
Now select the row for the stickers app and swipe left. The DELETE option should appear. Click DELETE and the app is deleted.