I can't think of any Lynnwood itself, but hwy 99 has several, from Shoreline north to Everett. For example there is one on 99 near the Country Farms (seasonal) produce stand, about 228th. That is probably unincorporated Snohomish Cty.
Near 208th in Lynnwood (on 99) is Taqueria La Fondita, essentially a taco truck that has put down roots in a former Taco Bell.
There are 2 Taqueria Guyamas on 196, one near 99, and one near the Lynnwood contention center (these don't have tortas). I like to stop at the carniceria in the same strip mall. Taqueria Riconcito is across 36th (this has tortas).
Taqueria La Fondita
20629 Highway 99, Lynnwood, WA 98036