Whole plant foods that have high concentrations of protein are beans (such as soybeans and tofu and tempeh), lentils, as well as other legumes; bulgur; nuts; and seeds. But as vegan ultramarathoner Matt Frazier writes https://biobodyboost.co.uk/products/peapro-high-protein-fibre-pea-powder?_pos=1&_psq=pea&_ss=e&_v=1.0