So I have both Scute Swarm and Mindlink Mech on the Battlefield and at least five Lands in play.
Now I crew the Mech with the Scute Swarm and play another Land.
Will I now get 2 normal Scute Swarm tokens or 1 normal and another one that's a 4/3 flying artifact creature vehicle?
And if I do get the vehicle version, will that token stay that way and can it duplicate through its Landfall ability like the other Scute Swarm tokens/copys?
You control Mindlink Mech, Scute Swarm, and exactly five other lands. Assume nothing is on the stack and it's your main phase. You activate Mindlink Mech's crew ability, tapping Scute Swarm to pay for it. This makes Mindlink Mech's triggered ability trigger.
All players pass, then that ability resolves. Mindlink Mech becomes a copy of Scute Swarm until end of turn, "except it's 4/3, it's a Vehicle artifact in addition to its other types, and it has flying".
All players pass, then crew resolves. Mindlink Mech becomes an artifact creature until end of turn.
Now you play a land, making the "Whenever a land enters..." ability of Scute Swarm and Mindlink-Mech-turned-Scute-Swarm trigger. Assume you put the former ability before the latter on the stack.
All players pass, then the ability referring to Mindlink-Mech-turned-Scute-Swarm resolves. Since you control at least six lands, you "create a token that's a copy of Scute Swarm", which means the token will have the copiable values of Mindlink-Mech-turned-Scute-Swarm, including being 4/3, being a Vehicle artifact in addition to its other types, and having flying (C.R. 707.2, 707.9c) (where the ability says "Scute Swarm", it means the permanent where that text appears [C.R. 201.4, especially C.R. 201.4a]). Any changes to the copied permanent's copiable values are not tracked by the token (see also this thread). (The effect from the crew ability won't be applied to the token since it's not part of the copy effect [C.R. 707.2].)
All players pass, then the ability referring to Scute Swarm resolves. Since you control at least six lands, you "create a token that's a copy of Scute Swarm", which means the token will have the copiable values of Scute Swarm (C.R. 707.2).