ありがとうございます！
It has to be this incredible advertisement(?) I found while shopping.
It features:
- a dog super high on some kind of green
- wearing a green backpack
- pushing a pram made out of a green watermelon
- filled with a green baby frog, a green snake, and what appears to be a tiny rabbit and a dog with binoculars
Featuring the text:
We were together back then.
I'm with you now.
And:
Inside the watermelon is a little froggy