You are looking for the magic words glycolic, lactic, mandelic or salicylic acid. The first three are AHAs so it may say AHA instead. Salicylic is a BHA.
Basically they're all good for both acne and anti-ageing as they chemically exfoliate your skin. BHA is oil soluble so better for blackheads as it can dissolve into the pore.
Unhelpfully the product may not actually say toner on it - traditional 'there to remove the last of your makeup' toners were mainly alcohol based and gave a tingling sensation which was sold as 'tightening pores' when it did nothing of the sort. There are still masses of pointless toners out there.
I love love love Paula's Choice 2% BHA. She also does AHA products as well.
LRP Effaclar range is acid based as well and lots of people on here have recommended Bravura London or Alpha H which are brands totally based around acid products. When I'm feeling really cheap I use SR Skincare which is really no frills but fab.
It's important for the acid to work correctly that the product is at the correct pH which the Paula's Choice one's are - not all things sold as acid are actually that acidic in the formula.
However on holiday I've just bought a cheap tube of 4 hour spot gel and used that all over as they're acid based too. Or some Clearasil pads. If you are spending loads of cash on your acid you are being ripped off 