The MN 12 Mahasinada Sutta indicated Jain practices done by Bodhisatta before his enlightenment (although the Pali commentary said it is during one of his previous lives, not in his last live):
And this is what my self-mortification was like. I went naked, ignoring conventions. I licked my hands, and didn’t come or stop when asked. I didn’t consent to food brought to me, or food prepared specially for me, or an invitation for a meal. I didn’t receive anything from a pot or bowl; or from someone who keeps sheep, or who has a weapon or a shovel in their home; or where a couple is eating; or where there is a woman who is pregnant, breastfeeding, or who has a man in her home; or where food for distribution is advertised; or where there’s a dog waiting or flies buzzing. I accepted no fish or meat or liquor or wine, and drank no beer. I went to just one house for alms, taking just one mouthful, or two houses and two mouthfuls, up to seven houses and seven mouthfuls. I fed on one saucer a day, two saucers a day, up to seven saucers a day. I ate once a day, once every second day, up to once a week, and so on, even up to once a fortnight. I lived committed to the practice of eating food at set intervals.
I ate herbs, millet, wild rice, poor rice, water lettuce, rice bran, scum from boiling rice, sesame flour, grass, or cow dung. I survived on forest roots and fruits, or eating fallen fruit.
I wore robes of sunn hemp, mixed hemp, corpse-wrapping cloth, rags, lodh tree bark, antelope hide (whole or in strips), kusa grass, bark, wood-chips, human hair, horse-tail hair, or owls’ wings. I tore out hair and beard, committed to this practice. I constantly stood, refusing seats. I squatted, committed to the endeavor of squatting. I lay on a mat of thorns, making a mat of thorns my bed. I was committed to the practice of immersion in water three times a day, including the evening. And so I lived committed to practicing these various ways of mortifying and tormenting the body. Such was my practice of self-mortification.