Maybe, but it depends.
I'm rusty on Dell hardware, so maybe somebody else can chime in here, but you will probably have to put the blade chassis switches into stacked mode in order to trunk multiple ports across the switches together, but it depends on the pNIC blade port to pSwitch port mapping in the Dell Blades and Chassis.
If it turns out that you do have to stack them to trunk the ports together in ESXi, then usually when you do this to switches, it makes it more difficult to do concurrent maintenance on them because code updates on them require that both switches be rebooted at the same time.
So, it really depends on your SLA with your users/customers. If you're supposed to guarantee 99.99% uptime, you probably want to avoid taking those types of outages if you can.
But, if that's something that you and your users/customers can live with (network outage to do switch code updates) then it should be fine.