The image is a slice of watermelon which has the words called "　I love summer". The words are depicted with　88 watermelon seeds .that is, they are written in "watermelon fonts". I guess there exists seed fonts like this in any fonts delivering sites.
西瓜字體
font、fruit、red、remix 221945、seed、summer、Summertime、watermelon、word、yamachem
使、水果、紅色、混音221945、種子、夏季、夏令、西瓜、字、Yamache米
資料來源：openclipart ( https://openclipart.org/ )