The answer is NO, kinda... But probably no in your situation.
I use LACP (with a switch) over 10GbE ethernet to my NexentaStor storage servers... but that's something that is only possible via VMware 5.1 and through the use of distributed vSwitches. That's a feature only available at the vSphere Enterprise Plus license tier.
What I do in situations where LACP isn't available to VMware is create an LACP bond from the storage to the switch and assign two or more ports to a storage vSwitch on the ESXi side.
Unless you move to 10GbE, you won't be able to get more than 1GbE speeds over NFS from VMware to your NFS storage. But most environments just don't need that type of bandwidth.
And the Nexenta side...
nmc@san1:/$ show network
Option ? aggregation
LINK PORT SPEED DUPLEX STATE ADDRESS PORTSTATE
aggr0 -- 1000Mb full up a0:36:9f:1:9c:16 --
igb2 1000Mb full up a0:36:9f:1:9c:16 attached
igb1 1000Mb full up a0:36:9f:1:9c:15 attached
Also see: VMware Distributed vSwitches (VDS) - Design, theory, *real* use cases and examples?