Preheat the oven to 350 degrees. Line a baking sheet with a piece of parchment paper.
Combine the almond butter, agave, and baking soda in a large bowl and stir until smooth. Add the tigernut flour and mix with an electric mixer or spoon until the batter is well combined.
Use a 2-tablespoon cookie scoop to form equal-sized balls of dough and place them on the prepared baking sheet, or use your hands to form the cookies: Spray baking oil onto your hands, then roll 2-tablespoon-sized balls of dough and place them on the baking sheet, leaving at least 2 inches of space between cookies. Press the center of each cookie with the handle end of a spoon or your thumb. Spoon ½ teaspoon of jam into the center indentation of each cookie.
Bake for 16 to 18 minutes, or until the edges are golden brown. Let cool on a baking sheet for 10 minutes. Once the cookies are beginning to set and are able to be moved, transfer to a cooling rack or a room-temperature plate. Allow the cookies to cool completely, 10 to 20 minutes more, before serving.