No, you can only have one Innovative Finance ISA for each tax year. So, if you open an IFISA for 2018/19 and put in some of your £20,000 allowance, you cannot subscribe new money to an IFISA with another provider in that tax year unless you transfer or close your current IFISA.

Your IFISA can hold more than one investment however. Your Triodos IFISA can
hold any eligible investment promoted on the Triodos Bank crowdfunding platform.