Actually, yes! If a recipe calls for praline paste and you don't have it, you can add nut butters instead. However, nut butters have a different flavor profile from roasted nuts in the praline and are not sweet at all (no caramel!). So you could add some sugar to nut butters and get a similar flavor (similar, but not the same). Alternatively, you can make the caramel as per the recipe. And then process the caramel in your food processor until it's very finely ground. Then you can add nut butter (at the same weight as the recipe), and process until smooth. The flavor will be somewhat different, but fairly similar. Just make sure that the nut butters are 100% nuts, and have no other additions.