Old School RuneScape uses the British convention for floor numbering: Ground floor, first floor, etc.
Professor Onglewip chathead

Professor Onglewip is a gnome sent by King Narnode Shareen to study human magic at the Wizards' Tower. He is found on the ground floor[?], generally in the library, although he can sometimes be found outside the tower. If players are doing hard orders in the Gnome Restaurant minigame they may have to deliver food to Onglewip.

Treasure Trails

Onglewip is the solution to the hard anagram clue: Profs Lose Wrong Pie. He will give the player a Puzzle box.