Kiwi.
Don't knock it until you try it.
It will have a similar acidity and texture to pineapple.
Use ripe kiwi and maybe a touch extra lime juice!
cooking.stackexchange.com/users/61074/StevenXavier
Your pineapple in a salsa is going to add some sweetness, a lot of acidity, and crisp chunks that will be important to the texture.
While other tropical fruits would be have the sweetness and interesting flavor, I can't think of anything that adds the acidity and texture.
When ripe, mango and guava are quite soft and although there are delicious mango salsas it won't be similar to the pineapple at all.
You also need a fruit that will not be too distinctive of a flavor because that might distract from the strawberry or clash with the mint.
I think that I would use meyer lemons.
The meyers would be sweet enough not to bash you in the face but they still have some of the tartness.
The texture pops kind of like a pineapple and the flavor compliments both strawberry and mint.
cooking.stackexchange.com/users/2001/Sobachatina
Mango, specifically green mango.
You'll get a similar texture, some tartness, and it is already a widely used thing in salsas.
You could easily pick how tart you want it by switching to s slightly riper Mango.
https://www.google.com/search?q=green+mango+strawberry+salsa&oq=green+mango+strawberry+salsa&aqs=chrome..69i57j33.4770j0j7&sourceid=chrome&ie=UTF-8
cooking.stackexchange.com/users/231/talon8
I'd lean towards mango, with some lime juice to help match the acidity.
cooking.stackexchange.com/users/64/jessecurry
other possibilities to substitute for pineapple in that salsa: 1)
fresh rhubarb 1/4" cubed, some extra rhubarb juice, and sugar2)
jicima cubed and gently steamed, tamarind paste, and lime juice3)
big blueberries, halved, and sugar 4)
tart green apples cubed plus sugar and a little apple cider vinegar
cooking.stackexchange.com/users/26186/pleasePassTheCheese
I need to sub pineapple with something else, im highly allergic to it.
What would be a good sub for pineapple, any other fruit or veggie for a strawberry pineapple mint salsa
cooking.stackexchange.com
<substitutions><fruit><pineapple><salsa>
cooking.stackexchange.com/questions/99637
cooking.stackexchange.com/users/76123/Dalia Sabau
Ripe kiwi with lime juice, meyer lemons or green mango with lime juice could add similar sweetness and tartness to pineapple. Pineapple can be replaced in sauces by kiwi and lime juice, meyer lemons, green mango or mango and lime juice.
Kiwi and lime juice can be used in place of pineapple. Meyer lemons have a similar sweet tartness to pineapples. Green mango and mango with lime juice can be used as a substitute for pineapple.