One of the closest looking ingredients to chia seeds is poppy seeds.
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Hemp seeds add a similar nutty flavor and nutritional value to your dish
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Oats can be used as a thickening agent in recipes like overnight oats or smoothies, but they won't provide the exact same nutritional benefits as chia seeds.
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Flaxseeds can be an excellent substitute for chia seeds in recipes that need a binding agent
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Amaranth seeds can be used as a substitute in some recipes that need a bit of texture
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Cornstarch can be used as a thickener in recipes that require chia seeds for their binding properties.
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Not only are black sesame seeds nutritious but they also resemble chia.