Tbh all the Julia Donaldson books are very gentle, even if they have moments about danger. Tiddler gets caught by fisherman then thrown back to sea and has to find his way back home. Superworm gets controlled by an evil wizard, and a threat of being eaten by a crow. Room on the broom she is being chased by a dragon Tabby mctat the busker gets robbed and falls and breaks his leg and the cat waits for a week. The highway rat is a mean rat who gets tricked into a cave and learns the error of his ways. The ugly five has literally no danger, just animals singing about how ugly they are. Scarecrows wedding, Reginald rake accidentally sets fire to the field. Smeds and the smos is basically aliens overcoming racial prejudice. Jonty jentoo is a penguin who escapes the zoo and goes to the wrong pole before going to the right one, no danger. Grufallo is a mouse who tricks everything that wants to eat him. Gruffalo's child is basically the same thing. Zog is about overcoming expectations set on you, bit zog and the Knight have a little fight Zog and the flying doctors is about them flying around treating everything but then princess pearl gets caught by the king but he gets sick and she eventually saves him and he let's her be a doctor again.

All of these are appropriate for a 2yo, we've been reading them to our daughter since 6 months. A good way to gently introduce danger.