dict1 = {'a': {'a-g': [[[1, 2, 3, 4]], [[1, 2]]],
       'a-w': [True, False, True],
       'a-x': [[1, 2, 3], [4, 5]],
       'a-y': [1, 5, 7],
       'a-z': True},
 'b': {'b-x': [1, 4, 5],
       'b-y': 3}}

dict2 = {'alpha': 'a-w', 'beta': 'b-y', 'delta': 'a-x', 'gamma': 'a-w', 'eta': 'a-g'}

arglist = []
vallist = []
for key, val in dict2.items():
    arglist.append(key)
    outkey = val[:val.find("-")]
    vallist.append(dict1[outkey][val])

from collections.abc import Iterable
from itertools import product

out = list(product(*[v if isinstance(v, Iterable) else [v] for v in vallist]))

finallist = []
for x in out:
    tempdict = {}
    count = 0
    for arg in range(len(x)):
        tempdict[arglist[count]] = x[count]
        count += 1
    finallist.append(tempdict)

for x in finallist:
    print(x)