No:

• The parliament includes all parliamentary groups that were elected by the people and garnered 5% or more of the vote or have won 3 or more direct mandates.

• The government consists of only the governing coalition parliamentary groups + chancellor + ministers; the chancellor is elected by parliament but need not be a member of parliament; the ministers are selected by the chancellor and likewise need not be members of parliament

In a stable majority government, the opposition parliamentary groups don’t have much say over new laws. However, they can come up with own bills (which usually fail due to the majority belonging to other groups), query the government/administration, or install enquiry committees.

However, right now, Germany has a minority government which means all new laws need some support of opposition parliamentary groups.

I guess what you mean is that the Afd has influence in parliament. And they definitely do: They hold speeches, they obstruct the government with worthless and repetitive queries, they draft (eventually-failing) bills, etc. However, to a large degree, their power also comes from being invited to political talk shows by public broadcasters and spreading their message on the interwebs.