The Gorgeous Life of Strawberry Chan (1999)

Blurb:
Once upon a time there was a talking frog. This frog’s name was Strawberry-Chan. Strawberry-chan loved his boy, Akiyoshi, very much... but Akiyoshi liked nothing more than to use a straw to blow Strawberry-chan up like a balloon - much to the chagrin of Strawberry-chan. Akiyoshi’s friends all feel very differently about Strawberry-chan. Some wish he were treated better, some really love Strawberry-chan, and one even wishes he was Strawberry-chan. With all of this love and abuse, will our frog even survive the first volume?

Source: www.anisearch.com/manga/794