you can literally just put "dole soft serve" in the amazon search bar....
but here you go.https://www.amazon.com/Dole-Soft-Serve-Pineapple-Pound/dp/B01666JBFG?th=1
have you tried adding spinach to a vegan pineapple ice cream mix?
we don't have a soft serve machine, but just a blender with ice cubes and a few tbsp of this mix.
You can buy the mix on Amazon
https://www.amazon.com/dp/B01666JBFG/ref=cm_sw_r_cp_apa_-ngIAbJR8RN2J
Mix: https://www.amazon.com/Dole-Soft-Serve-Pineapple-Pound/dp/B01666JBFG/
The ice cream maker I personally use that works great: https://www.amazon.com/Cuisinart-ICE-21PK-Frozen-Yogurt-Sorbet/dp/B003KYSLMW?ref_=ast_slp_dp&th=1
The method I tend to follow: https://youtu.be/ZLhjuWRVBuw?t=142