You can specify two (or more) Open Graph images, the first, a rectangular image for FB and the second, a square image for WhatsApp.
<meta property="og:type" content="website">
<meta property="og:url" content="https://sitename.com/">
<meta property="og:title" content="My blog"/>
<meta property="og:description" content="Tutorial..."/>
<meta property="og:image" content="https://sitename.com/img/tutorial_1200-600.png"/>
<meta property="og:image:width" content="1200"/>
<meta property="og:image:height" content="630"/>
<meta property="og:image" content="https://sitename.com/img/tutorial_400-400.png"/>
<meta property="og:image:width" content="400"/>
<meta property="og:image:height" content="400"/>
WhatsApp uses the last image.
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