Yes! Don’t worry - you can get them back.
Open any web browser eg Safari on your iPad and go to https://ticktick.com/#q/all/trash. You should see your deleted tasks.
Don’t worry if you can’t see them yet. Try refreshing / reloading the page. If that doesn’t work go to the menu in the top left corner (three horizontal lines next to the word Trash), tap on your username and tap Sync. That should make them appear.
When you do see them, you’ll be able to restore them. I think you might need to do this with each task individually.
I find that if I do this on an iPhone I can tap on each task and restore it to the inbox, then I have to move it back to another folder from there, whereas on a desktop computer I can click on a task and restore it to any folder. Not sure about the iPad.